Disclaimer: I do not own Transformers or Buffy the Vampire slayer

A/N – This story was adopted from Thebossbot2012 – It tells the story of how Buffy and Faith met the Autobots, then please read my story Don't ever leave me which is the follow up story.

Summary – When Optimus Prime is severely injured and taken prisoner by Megatron; NEST find themselves being ordered by General Morshower to trust Rupert Giles watcher to Buffy Summers and Faith. However the Autobots and NEST need a lot more convincing; then the Englishman's word that they can handle the job.

Buffy/Optimus

Faith/ Ironhide

Fandom – BayVerse after ROTF

Title – That Fateful day

Chapter Four

(Decepticon base – Optimus' cell)

Optimus onlined his optics to find his brother opening the cell door, and carrying several energon cubes. He sat down next to Optimus; and gently pulled Optimus up into a sitting position and of course the action made his joints groan and caused Optimus to hiss in pain. Optimus couldn't meet his brother's gaze at first; he noticed the cowl hiding part of his damaged face.

"What new torment is this you've cooked up for me?" Optimus asked wearily. "You've never been kind to me but only before the war, so why are you bothering now?" Optimus asked.

Silence…..

"You were not meant to be harmed like this…That was not my order…" Megatron mumbled.

Optimus didn't answer instead his trembling hand moved toward his stomach; where energon dripped from the wounds on his body. Megatron looked at his brother and sighed. "If you had just listened to reason we would not be enemies, if you hadn't sent the Allspark away. My master, whom if memory serves me right you viciously destroyed, and along with half my face Optimus." Megatron snapped.

Optimus glanced at his brother, and then looked away.

"So now I am to blame for everything, you killed me and to the best of my memories you've never EVER killed me! We always battled each other to a standstill, but you cheated you knew I was distracted and you struck. "Optimus spat the words at his brother, like he had a bad taste of energon in his mouth.

Megatron narrowed his optics at his brother then. "It was what my master wanted and I had to follow his word." Megatron remarked.

Optimus looked up at his brother then.

"So the fact I am your brother MEANT nothing to you, did you feel nothing when I perished? Or have I truly become nothing in your optics Megatron, we used to do so many things together as sparklings and younglings." Optimus whispered, as he shook his helm clearly saddened by the turn of events.

"On the contrary it does mean something it always has…" Megatron said as he got to his foot pedes and gently laid his brother back down. "I will get Hook and Scalpel to tend your wounds brother just relax alright?" Megatron said giving his brother one last look and turning around walking out of the cell.

Optimus was to say the least confused by this, but said nothing else to warrant angering his brother. He just tried to get comfortable the best he could, he hurt and was tired and needed recharge to save his strength.

(Autobot base)

Buffy and Faith found the idea of alien robotic beings very intriguing, but they needed to rescue the Autobot leader, and for some strange reason NEST was still not pleased two 'little girls' were going to be able to do what they should be doing themselves.

Buffy looked at Major Lennox and her sister slayer however was too busy watching Ironhide and liking what she saw. "Faith…?" Buffy said.

Silence….

"FAITH,,,!" Buffy yelled finally getting the brunette's attention finally.

"I am right here B no need to yell…" Faith said sneaking one more look at the huge massive Autobot Ironhide. "You are hot…" Faith said, as Ironhide didn't really know if he should be flattered or disgusted by the organic femme who said it.

"You can jump his circuits when we get back with their Leader, come on Faith." Buffy replied firmly as several Autobots glanced in Faith's direction.

"Well hey; she has dated vampires so why can't I wanna rock your world hot stuff?" Faith asked as Ironhide could not help but become slightly flustered by her words.

Buffy growled and grabbed Faith. "Let's go Faith you can jump him later." Buffy retorted.

"Oh I plan on it B, I plan on doing just that…" Faith said.

Faith and Buffy got into the vehicle with Xander; while Giles stayed behind at the base. Giles glanced at the NEST soldiers and caught their disgusted looks. Giles removed his glasses and cleaned them once again, while Epps and Lennox watched him.

"You do know that we could have handled this on our own, Rupert Giles." Lennox remarked.

Giles smiled politely. "Then why did your General Morshower call in my slayers then?" Giles remarked as Lennox grumbled.

"We are going too, Ironhide and Sideswipe you're coming with us NEST has never had any women in it we aren't being shown up by two girls." Lennox snapped as he and Epps got into Ironhide and Graham got into Sideswipe.

The weapons specialist and the frontliner followed close behind, which the girls and Xander noticed all too quickly.

"I wonder if they believe they are being stealthy?" Buffy said as Faith smirked.

"That's my big black bot..." Faith remarked with anything but a nice smile, it resembled a lustful smile to Buffy and Xander.

"Faith, do you see the size of that bot, he massive…" Buffy replied.

"Yea and your point….?" Faith asked.

Silence and Buffy rolls her eyes.

"I give up…" Buffy replied as Faith chuckled.

"You should know me by now B, I do what I want when I want…. Just sayin…" Faith replied with a shrug.

"Yes, I know Faith and how well I know that little fun filled fact." Buffy grumbled as they headed for a possible location that the Autobot leader was at.

Xander pulled close to where the abandoned warehouses were out in the middle of nowhere, Buffy and Faith grabbed rocket launchers from the back of the vehicle. It was then Skywarp and Starscream came out yelling at each other over Thundercracker's offlining.

"Look Screamer I am just as upset about Thundercracker's offlining, but Megatron has a point you almost offlined Optimus." Skywarp said as Starscream snarled.

"I do not care about what Megatron said, he is a poor leader for ever showing kindness to his brother. Megatron is a fool; he could have destroyed Optimus he is weakened now." Starscream hissed.

"You know the only fool I see is you numnuts…" Buffy remarked.

"He looks more like a deformed jet or a deformed….." Faith started to say as parked a way from them was Sideswipe and Ironhide.

"Dorito….." chimed in Xander.

Faith growled and hit Xander.

"You stole my word; I was going to call him that." Faith stopped and glanced up at Starscream then. "You are a dude right?" Faith asked.

Silence and then Starscream snarled.

"I am the great Lord Starscream commander to the Seekers and second in command to Lord Megatron. Who are you humans?" demanded Starscream.

"Ya know, you never answered my question…" Faith remarked sourly.

"Maybe that's because it doesn't know what it is maybe it is confused?" Buffy asked looking up at Starscream. "Are you confused?" Buffy asked.

Faith and Xander tried to stay serious, but the look on Buffy's face was suddenly too amusing not to laugh. Starscream looked if not anything but furious; he glanced over at Skywarp who was smirking. "You slagging idiot how dare you laugh at me, who do you think you are?" he demanded. "And you humans are going to be destroyed!" Starscream snarled.

(Meanwhile in Optimus' cell)

Megatron walked in and switched on a monitor, so Optimus could see what was happening.

"Apparently a rescue party was sent for you not much if you ask me three humans two femmes and a mech." Megatron remarked showing Optimus.

Optimus was curious why Megatron didn't sound an alert and remove him, but he didn't all he did was watch the monitors events. His optics slowly focused to the screen and his optics hit on the little blonde femme, she was feisty for a human.

"Oh and we're the slayers…" Buffy snarled as she aimed the rocket launcher at Starscream as well as Faith did.

The rockets were aimed at him interfacing units blowing it apart making the seeker snarl in pain.

Skywarp's hand out of instinct went to his own interfacing unit, he stumbled back and took off into the air shocking and angering Starscream.

"You coward…!" Starscream shrieked. "I will have your spark for this….!" Starscream wailed.

While inside Optimus' cell he was stunned to find Megatron cackling at Starscream's misfortune.

"I will destroy you wretched humans for this….!" Starscream roared as Faith and Buffy let loose with more rockets at Starscream.

Starscream tried to send a missile at the human femmes, but between all his severe pain he felt his aim was off. He only blew up the vehicle they arrived in, which only served to anger him more.

He sent a laser which fried some of Buffy's hair and a piece of her shirt. She was not happy not one little bit.

"Oh shit, you're in trouble…" Xander said.

"Oh yeah, wouldn't wanna be in your shoes fly boy." Faith said matter of factly.

Starscream snarled. "What and why not?" he demanded.

"You fried my hair do you have any idea how hard it is to get this color of blonde?" she snapped and added. "Not to mention this shirt it is my favorite shirt and you fried it up on the side. I do not take to kindly to that and you will pay for it!" Buffy snarled as Starscream laughed.

"You hurt me how absurd…." Starscream said painfully.

"We gotcha before didn't we?" Faith snapped.

"Luck and now I will have my revenge…." Starscream started to say.

Buffy glanced around, and saw a man hole cover; and ran over to it and slammed her foot down on it. It flipped into her hand, and she spun around and then let the cover go. "Hey stupid look….." Buffy snapped and Starscream being the airhead he was looked.

His head was instantly removed by the cover going through the air at high speed.

"Not chuckling anymore dumbass are you?" Buffy snapped as Buffy and Faith bumped knuckles.

Lennox and Epps stared at the body that once was Starscream, they were speechless at first. Suddenly Sideswipe came over Ironhide's radio just as amazed as they were.

"They took down Starscream…?" Sideswipe remarked.

"Let's go get our leader…. They are going to need to need to bring the big bird Lennox no telling how injured Prime will be…" Ironhide said.

(In Optimus cell)

"That human femme is plucky Optimus, she's actually just your type I will leave you now brother perhaps we will meet again who knows." Megatron remarked as he took off transforming into a perverted looking truck and disappearing through another escape route away from possible Autobots and the two strange human femmes calling themselves slayers….

Optimus couldn't imagine humans having the sort of strength these two did, but one thing was certain he felt a need to get to know the blonde human very much.

Optimus was confused by his brother's behavior; it was almost like he wanted to change. He could have offlined him, but he didn't he even refueled him and patched him up. The fact his second in command was offlined didn't seem to bother him either, that was also a puzzling develop for him as well. He looked up hearing Ratchet's voice, and then he saw the two human femmes sitting on the catwalk looking down at him. The look in the blonde femme's eyes was filled with compassion, but was it for him?

(Optimus' POV)

The human blonde femme was quite strong; she was the one along with the brunette who offlined Starscream. "How are you feeling?" Ratchet asked me.

"Tired and in pain…" I answered as I glanced at the blonde once more.

She smiled at me, while the brunette had a snarky expression on her face. "This has been real B, but I need to find that big bulky black bot." she said.

I assumed she was speaking about Ironhide; it would seem the suicidal femme liked him…. Primus help her when Ironhide found out about it, he hated anything what was the human saying mushy.

"You are talking about Ironhide, I presume?" Ratchet asked.

Silence…..

"Is he the big bulky black bot?" Faith asked.

"Yes, you were introduced early on have you forgotten so soon?" Ratchet demanded in an impatient tone. "Primus, you humans can be dense….." Ratchet retorted.

"We are special humans don't forget that doc bot S.L.A.Y.E.R.S; come on say it with me S.L.A.Y.E.R.S…." Faith said softly and slowly like she was talking to some kid who was misbehaving.

"You have nanoseconds to get out of my medical bay you crazy snarky femme, go harass Ironhide..!" Ratchet ordered as Faith hopped up and smirked.

"Later B….." Faith replied.

Buffy smiled and waved, as she glanced back at me. The look in her eyes were soft and inviting she was pleasing to the optics. Oh Primus, what was I thinking she is human, and I am Cybertronian.

"Hey you alright down there?" Buffy asked me.

I glanced at her, and then I looked at Ratchet. "My spark chamber Ratchet it feels like it may be dented." I whispered.

"Okay let me take a look…" Ratchet replied.

The human femme looked back at me and smiled. "I'm Buffy by the way and the other girl was Faith, we actually are Vampire slayers from Sunnydale. General Morshower contacted our watcher and that's how we got involved." She explained.

"I see…."I replied…."Thank you for saving me…" I added.

"It was our pleasure Optimus…." She said until Ratchet coughed loudly.

"I need to fix this and I need to focus….." Ratchet started to say as he opened my chest plates.

Before either of us could say anything Buffy was jumping into my chest plates, feet first and landing inside.

"Buffy, watch yourself…!" Ratchet exclaimed.

(Normal POV)

Buffy had landed near the Autobot leader's spark, Optimus' spark flared at the invasion not knowing if this intruder was an enemy or ally. Buffy knelt down by Optimus' spark chamber the crackling of the spark made her just silently sit allowing it to see she was no threat.

The spark tendrils broke apart and investigated the being in its master's chest plates. Buffy sighed, while the tendrils wrapped around her body slowly moving this way and that, once it was satisfied with knowing this being was safe, they welcomed her and pulled her closer.

Buffy being a supernatural being herself was able to draw on and pull in Optimus' emotions. She gasped; when she touched his spark chamber she received vision after vision of Optimus' life. The Allspark's release, its destruction, Cybertron's destruction; she saw his death by his brother's hand. His resurrection and she felt his pain and guilt over many things; but mostly she felt the intense pull that she shared a common bond with this being.

She ran her hands over the spark chamber, and whispered softly and soothingly; making Optimus shutter out of instinct. However he knew she knew his secrets, and he was suddenly not so sure of himself then. He growled, and when he did Ratchet misinterpreting the growl reached in and plucked her out of his chest plates.

"Out you go…." Ratchet said.

Buffy thinking she had done something wrong felt extremely bad. "I'm sorry, I didn't hurt you did I?" she asked.

Silence….

Optimus couldn't answer he wasn't sure what the problem was; so instead of letting her know what was really wrong he remained silent. Buffy felt Ratchet put her up on the catwalk once more, he looked angry with her.

"Sorry, I didn't mean to hurt him…." Buffy said.

"Why don't you go out with your friends Miss Summers…?" Ratchet replied.

Buffy sighed as she glanced down at Optimus; he wasn't even looking at her now.

"Okay, I am sorry…." Buffy said as she left them alone.

Ratchet peered down at his patient, he had seen that look in his leader's optics way too much…..something was bothering him.

"What is it?" Ratchet asked.

Silence…..

"I was not mad Ratchet I was simply confused…" Optimus said.

"Confused about what?" Ratchet asked.

Optimus merely looked away not sure how to explain it himself. "She tapped into my emotions and feelings….."

"But Optimus only a potential mate can do that and she is….. Human….?" Ratchet replied as Optimus didn't even bother to look at him he had no idea himself what was going on all he knew was his spark connected to the young human femme; and in all honesty Optimus was scared but slightly intrigued at the thought.

However one thing was certain he wanted to experiment with it, if the little human femme was up to it…..

(Outside the medical bay, and Autobot hanger)

Buffy was sitting on the ground next to Faith, who had a loopy smirk on her face.

"Someone looks happy, do I want to know?" she asked.

"I talked to Ironhide I made him see things my way…." Faith said.

"Of did you…?" Buffy asked.

Silence…..

"You want the leader admit it, B…" Faith said.

Buffy sighed then.

"Yea I am attracted to him, but what if he doesn't want me I am human…" she said.

"B, don't tell me you are nervous?" Faith asked in a shocked tone of voice.

Buffy looked at Faith with a murderous glare.

"Are you….?" Asked a deep rich baritone voice, which made every female close by who heard weak at the knees.

Buffy looked up and saw the flamed leader watching her with interest; he suddenly transformed and opened his door for her. She did not hesitate she jumped into his cab with ease, she went to the driver's side. Only to get a wicked shock through her body from Optimus and a chuckle from him as well.

"No backseat drivers…" he chuckled.

"Oh yuck it up Flameboy…" Buffy said.

Silence…

"That is not my name Miss Summers…" Optimus said.

Buffy leaned in and ran her hands over his steering wheel making him shudder slightly, and her smirk.

"Oh I know and someone has an interesting playful cute and cuddly side, don't they?" Buffy asked.

Optimus huffed at that pretending to be insulted by the remark.

"Leaders are not cute and cuddly Miss Summers…" Optimus remarked.

She laughed.

"Bet you are though bet I can make you purr… Oh my God did I just say that out loud?" Buffy asked.

Silence…..

Optimus was intrigued by this human femme, she was feisty and she was a fantastic fighter. "Buffy, do you know why I brought you out here?" he asked.

"No not really, why did you bring me out here?" she asked.

"I wanted to talk to you about possibly exploring a possible uniting….."

"Uniting…..?"

Silence….

Optimus growled.

"Coupling….." he mumbled trailing off very flustered.

"Coupling…?" Buffy asked.

Silence….

"Being mates…." He said.

"You want to make me your mate?" she asked.

"Affirmative,"

"So you like me?" she asked.

Silence…

"Well yes, indeed…" Optimus said as he wondered if Ironhide was having any luck with the dark haired femme.

(Where Faith is)

Faith heard the sounds of a pickup and the sounds of a horn blaring, Faith stood up with that cocky smirk she had. She saw Ironhide pull up and open the door for her. "Isn't this the princess treatment, what's the occasion?" she asked.

"Don't get used to it; I ain't doing it all the time. I just wanted to talk to you about some things." Ironhide said as Faith hopped in.

Faith put her feet on the dashboard and Ironhide growled and stopped suddenly.

"What….?" Faith demanded.

"Get your feet off of my dash…." He growled.

"Oh please, no way…." She snapped.

Ironhide rumbled then, which made Faith laugh.

"Do you think I am a clown?" Ironhide asked.

Silence….

"Now….? Yeah you are being a clown bad ass clown but nonetheless a clown…." She remarked as he tossed her out of his vehicle form and activated his holoform of his robot self.

He stomped over while the brunette slayer cackled constantly, he was on her within seconds growling.

"Do I intimidate you at all?" he demanded.

"No not so much Ironhide, but I like you a lot." Faith said with a smirk as Ironhide's optics blazed with fury and lust.

Ironhide picked her up making her screech suddenly.

"Put me down Ironhide!" she demanded.

"NO You are going to learn some manners, and I am going to teach them to you MY way." He snarled.

"Oh snap, okay I just may be a little intimidated." Faith said.

"Too late femme…." Ironhide snarled as he tossed her into his vehicle form and took off with his captive for an undisclosed location.

(Where Optimus and Buffy were)

Optimus allowed his holoform to activate and he watched her heatedly.

"I would like to try this Miss Summers, if you are game that is?" he asked.

"Buffy, you can call me Buffy and I have been with Vampires before so why not dating an alien being is just an added bonus right?" she said leaning in and kissing him.

"You do realize one thing Buffy I am not like human males; I cannot interface like humans will that be a problem for you?" Optimus asked.

"Interface….? Oh you mean sex that's okay, I am sure there are ways around that besides there are more to relationships then sex. But I still bet I can make you purr loud like a big cat, what do you think Optimus?" she asked as she slid down on his lap and kissed his lip plates once more.

She continued until she did make him purr and as she giggled about hearing him purr; she suddenly heard his horn blare when she found his antennas were his weak spot his very weak sensitive spot….

"Primus help me…." He moaned.

"Nope no one can help you, the slayer has you now; Optimus you've met your match….."

Optimus didn't care, he cared about this human, she was strong and she carried the same burdens he did. They were matched and he intended on keeping his slayer for a very long time….

Oooo ooo oo o

Story continues with the story 'Don't ever leave me'