A/N: I have been meaning to write a Severitus for a long time but have never found the time actually to do so. This story is my first fic and since most of it is already written, I will try to post a new chapter as often as I can. The first few chapters are short but future chapters will lengthen as the story continues. This story is AU and will contain corporal punishment (this is my only warning about CP being in this story). Some characters may be OOc in some ways to suit the story. Read and Review!

Disclaimer: I do not own Harry Potter nor do I make any profit off of the story.

As he opened his eyes, Harry Potter felt a nagging, painful headache. He groaned and blinked several times in an attempt to relieve the pressure. Ignoring it for now, Harry sat up and looked around. The last thing he remembered was drinking himself to oblivion at Hog's Head. This place wasn't the bar. It looked like a kid's room. The room was rather large, with a wardrobe straight across from the bed, a child size desk in the far right corner, and a connected bathroom. He also noted he was in a toddler sized bed. What happened last night? Had I been so drunk that another wizard took pity and let me stay the night? The door to the bedroom opened, and Harry prepared to express his thanks to his host, but the person who walked in rendered him speechless.

Professor Snape! Harry thought, but that's impossible, he died in the war.

Harry watched as Snape, his longtime hated, dead potions professor, walked over to a wardrobe and pulled out a child's outfit. Then he turned and looked directly at Harry. Harry realized that Snape looked years younger.

"Good morning, Harry," Snape said with a soft smile. "Glad to see you're up." Snape approached the bed and pulled the blankets back. "Come on, out with you."

Harry was shocked yet again. He was the size of a toddler! What was going on? He looked back up at Snape, unsure of what to do or say. Harry must have stared at Snape for too long because Snape frowned.

"Are you alright, Harry? You look a bit pale." Snape reached out a hand towards Harry and looked surprised when Harry pulled away from him.

"I'm sorry . . . I didn't mean to startle you. Let me feel your head, you might have a fever." Snape frowned, but reached for Harry again, and this time, Harry didn't move. The hand was warm when it fell on his forehead.

"You feel warm. Do you feel sick? Does your head hurt?" Snape asked, moving his hand to feel Harry's cheek. Harry was uncomfortable with all the touching, especially when the person touching him was someone he had watched die, but he decided he might as well as play along with whatever was going on. At least until he figured out what had happened last night. And his head did hurt, so he nodded to Snape's question.

"Hmm, I'll get you a couple of potions for that. But first, let's get you dressed." Snape picked Harry up and rested him on his hip, an act which made Harry stiffen.

"You are dry today. What a good boy!" Snape praised, patting Harry's bottom. Harry felt uncomfortable with everything that was happening and blushed at the fact that he was wearing a diaper – no, a pull-up. And Snape was carrying him! Like he was some baby! Well, he looked the part, but Harry wasn't sure if he liked the fact that he was so small and vulnerable. Where is my wand? He was carried into the attached bathroom and set down in front of the toilet. He looked at Snape and was surprised to see how little he really was. He only came up to Snape's hip! And to see Snape's face, Harry had to look up.

"When you're finished, come downstairs. I need to find your potions. Do you need help with anything now?" Snape questioned. Harry shook his head, his face burning red with embarrassment.

"Are you sure?" Snape asked, glancing at the clothes he placed out on the bathroom counter.

"I can do it." Harry assured, nodding his head. His voice was high and squeaky. How pathetic! Snape nodded then left.

Once he was alone, Harry quickly took off the pull-up he was wearing, tossing it into the garbage can by the toilet, then took care of his business since he did need to go. He looked through the clothes and was glad when he found underwear instead of a pull-up. I hope I don't see another one of those again. Harry changed into the clothes Snape had picked out. The shirt he discovered was a button down top. His little fingers struggled with the first one for a few minutes

"Stupid buttons," Harry muttered. He finally managed the first one then left the rest unbuttoned. Was this an alternate universe? It would make sense. But how did he get here? And how did he get back to his reality? Harry looked in the mirror and nearly fell back in yet another episode of surprise. He resembled Snape! His hair was still black but had lost the messy, mop-like look James had possessed. His face had more Snape-like features, the higher cheekbones, and a paler complexion, along with his green eyes. Snape must be his father in this world, and Lily was still his mother. Thank Merlin he didn't have that nose. The relationship between his mother and Snape wasn't hard to explain after viewing Snape's memories from his world. But how did this world come into being? Harry figured he'd been in the bathroom long enough (he really couldn't hide in a bathroom all day just to figure things out, now could he?) and went out into the hallway. He wondered which way to go for a moment before noting Snape walking down the hall toward him. He stopped before Harry with an amused expression.

"Well, you managed one button. That's progress isn't it?" Snape commented before fixing Harry's shirt. Harry watched as Snape buttoned the top, trying hard to keep still and not back away like he originally intended to do. Snape seemed to think that invading one's personal space was acceptable. "C'mon, breakfast is waiting."

Harry followed Snape downstairs and through a living room, which brought them to a kitchen. There Snape poured a bit of pepper up potion onto a spoon.

"Open up." After a quick debate in his head about whether or not he could trust the potions Snape was feeding to him, Harry opened his mouth and accepted the potion, his eyes watering and nose scrunching at the taste. "Swallow, young man." Snape encouraged with a bit of a warning tone. Harry did so, wondering why Snape felt the need to demand Harry to swallow. What else would I do with the potion - spit it out? Harry then remembered that it probably wasn't uncommon for little kids to spit medicine out. But I'm not a little kid! I'm 21! "One more," Snape said. This time, it was a headache reliever. Harry took the next one, swallowing quickly and making a disgusted face.

"Sit down and eat your breakfast. Your uncle will be here soon." Snape said. Snape has a brother? Harry couldn't imagine another evil bat, although this Snape has been pretty decent so far. His headache was already fading thanks to the potion. Eggs, sausage, and strawberries covered his plate and he dug in eagerly. Snape merely read the daily prophet and drank a cup of coffee. Harry felt awkward in the silence, but it didn't seem to bother Snape. After he had eaten most of his breakfast, Harry heard the Floo fire up.

"Uncle Sirius is here! Where's my favorite nephew?" Came a very familiar voice.

"Your only nephew." Severus muttered from behind the paper.

Harry jumped from the table and ran in the direction of the voice. It couldn't be – could it?

When Harry entered the living room, he saw Sirius - alive and smiling - standing in front of the fireplace.

"Siri-Uncle Sirius!" Harry cried. Sirius's smile grew bigger when he saw Harry, and he picked him up and spun him around. Harry laughed in delight. So in this world, Sirius is his uncle. Maybe this world wasn't so bad. Harry hugged Sirius hard, forgetting how odd that might seem. But after losing him in the war, Harry never expected to see him again. All he wanted to do was hug him tightly and never let go, for fear Sirius might disappear again.

"Easy, tiger. Did you miss me that much?" Harry nodded into Sirius's shoulder, enjoying the feeling of being held and hugged. "A month is a long time isn't it? Sorry I missed your birthday, kiddo. How's it feel to be four years old? Think you're ready to move out and get a job now?" Sirius teased. So that's how old I am, Harry thought. What four-year-old has a job? Harry gave a short laugh.

"First he has to get through Hogwarts." Snape said, entering the room, "He's got some ways to go before that happens."

"I have a feeling your father doesn't want you to grow up. And honestly, neither do I so slow down a bit, okay. Look, you're already starting to get heavy in my arms." Sirius acted as if Harry weighed a ton as he moved around before he finally set him down. Harry looked up at Sirius, amazement still written all over his face. Snape moved forward and laid a hand on Harry's forehead.

"At least you're feeling better, now. You're not as warm." Snape commented.

"Was he sick?" Sirius said, his voice filled with concern.

"He had a headache this morning though that could have been from all that sugar you had last night, young man." Snape gave Harry a glare though it could have been a mock glare. Harry couldn't tell. I'll have to learn more about this Snape, Harry thought, I already know he's supposed to be my father. And Sirius, I can't believe he's alive.

"He's been awfully quiet this morning as well." Snape commented. Harry looked at Snape and yawned, hoping to find some way to reason his 'differences' this morning.

"Ah, you're tired still. I'll make sure you get your nap later, or we're going to have one cranky Harry." Snape said. Well done, Harry, you've just earned yourself a nap. Just great. And knowing Snape from my reality, I will most definitely be taking a nap later.

"I don't need a nap. What are we doing today?" Harry asked.

"Anything you want to, tiger cub. We could go to the park, a Quidditch game . . ."

"No, not today. I have things I need to do, and last I knew you had work to catch up on as well." Snape intervened. Always the life of the party, Harry remembered. Snape looked down at Harry and smiled softly. "Why don't you take Harry outside for a bit and play on the swings or something?"

Sirius led Harry outside and shifted into Padfoot, a large black dog. He grabbed a stick and shook it in his mouth before bringing it to Harry. Harry grabbed the stick and played a game of tug-o-war with Padfoot. After romping around with Padfoot for a good portion of the morning, Padfoot finally tired and shifted back into Sirius.

"How about we play on the swings for a bit?" Harry only agreed, not sure what else to do since he was unfamiliar with this new life. Harry discovered that his tiny body could not operate the swings, but he allowed Sirius to push him. They talked about the last time Sirius had visited, and Harry had decided to use Sirius as a pillow, which prevented Sirius from being able to move. Harry had no recollection of the event, but nodded and laughed along with the story.

After lunch, Sirius had to leave, complaining about how Aurors are always busy. So Sirius's second chance involved becoming an Auror. That left Harry alone to explore his new surroundings. He located two bathrooms, a study, a couple of large closets, a library with a ton of books, a guest room (with two queen beds, a full bath, and an attached living area), and the door that led down to Snape's potion lab all on the first floor. Harry went back upstairs and explored some more, finding the master bedroom, two other bedrooms, his room, a few more hall closets, and one-half bath. He did find a room full of toys in one of those two other bedrooms and guessed that this was his playroom. He didn't see any stairs that would lead to a third floor or an attic. Funny, the house looked bigger on the outside, Harry thought.

Harry laid down on the couch to think about what happened last night and about how he got here. He and Ginny were planning for their wedding. However, Harry had needed a break from the stress of planning out days and decorating, and then the war caught up with him. Depressed, Harry decided he'd go out for a drink. One firewhiskey turned into five, and then nine, and then Harry blacked out. How did he get here? Dumbledore would know. There had to be a Dumbledore here that could help him figure this out. By the looks of things, he went back in time as well as to a new universe. Maybe if he found the Dumbledore here, he could explain his situation and Dumbledore would be able to help him return to his world. Before he knew it, Snape was calling his name. Harry opened his eyes and saw Snape's head inches away from his. He noted a clock on the wall and realized he had slept for two hours.

"Hey, baby. Dinner's ready; then we can read or play a game afterward. But it's an early night for you, son." Snape said. How time flies, Harry thought.

After dinner, Harry followed Snape to the living room and waited for further instructions, unsure of what to say or do. Snape sat down on the couch and studied Harry as if expecting him to make the first move.

"Well, what do you want to do?" Harry looked around trying to find where the games were located before noting a small gobstones table secluded off in the corner of the room.

"Gobstones!" Harry said, pointing at the game. He smiled when Snape groaned. Harry was surprised when he managed to beat Snape in a game of gobstones but laughed delightedly when the gobstone spat at Snape. He figured the game was too simple and childlike for Snape's intelligent, complicated brain and snickered at the idea.

"Defeated by a child." Snape huffed, "Have your laugh son because now its bedtime."

"Aww." Harry whined though it didn't sound very convincing. He found himself being lifted again. I wonder if he knows that I have legs, too.

Snape carried Harry upstairs and set him down in the bathroom, leaving Harry to himself while he sought out pajamas. Snape brought back his sleepwear along with a pull-up, but Harry didn't want to wear that.

"I don't need it. I was dry this morning." Harry argued, trying hard not to blush from embarrassment.

"That's one morning, Harry, let's not risk anything tonight, alright?"

"I don't want to wear it!"

"This isn't up for debate. You are wearing this whether you want to or not."

"I don't need it. I don't like wearing it. I'm a big boy." Harry felt rather childish saying that.

"You are a big boy, Harry, but if you can go a week without wetting the bed, you can start wearing underwear to bed. Until then, you are wearing a pull-up."

"No. I won't put it on." Harry crossed his arms and frowned at Severus.

"You can either put it on by yourself or I'll put it on you after warming your bottom, young man." Severus growled.

Deciding he didn't want to experience his first spanking so soon, especially with Snape, Harry pouted as he put the pull-up on and finished dressing. It was strange and unnerving having Snape watch his every move, considering he was standing bare in front of his previous professor, but he guessed it was a parent thing. As he crawled into bed, Snape tucked the covers in and kissed his forehead.

"Goodnight baby. Love you." Snape said before turning out the light and leaving the room. Harry remained silent unsure of what to do or say. Snape was everything he hoped a parent would be. Although he didn't see much of him today, Snape had tucked him in and said goodnight. How many nights had he laid in his cupboard at the Dursleys and wished for such a thing? Harry closed his eyes, a tear escaping and sliding down his cheek. Tomorrow, Harry would search for Dumbledore, but did he really want to leave this universe and miss out on the chance of a real family? Even Sirius was here.

I'll sleep on it, Harry thought, and seconds later, he was sound asleep.