Disclaimer: I do not own Back to the Future. I also don't own the Future Son Universe, which belongs to EmmettMcFly55.

Author's Note: Marty McFly celebrates his birthday party with his parents and future son, who is currently presumed to be his twin brother.

June 8, 1986
12:30 PM PDT

To the casual on-looker, Calvin Arthur McFly might actually appear to be your average 1980s teenager. However, even after over half a year, Calvin sure felt somewhat out of place. After all, he rather belonged to an era that was thirty years from now. Sure, there were things he loved about the '80s. Still, he also missed a lot from his own era.

The fact that he was in a rather unusual relationship with his parents and grandparent also didn't do much to help matters. Being on a first name basis with his parents felt so surreal, as well as did actually addressing his grandparents as "Mom" and "Dad".

On top of everything, he and his father were presumably twins. He and his father got along, most of the time - which, of course, he quite enjoyed. He wondered just how it might affect their relationship, if he ever did actually end up returning to the future.

As his father avoided getting into the fateful accident that would be the turning point of his life, he figured that his family life would end up being rather different. While his parents were never overly strict, they often seemed to be unhappy. It simply was as if the teenage version of his father - as well as his mother - was a different person.

"Are you really feeling okay, Cal?" asked a gentle voice. Calvin glanced to his right, as the teenage boy who would become his father flashed a lopsided smile. "Listen, I sure understand... Well, I know that your birthday was two months ago. Still, it's really..."

"It's a nice treat, uh, Marty," Calvin replied, nervously. "It was good of, uh, Mom and Dad to take up to Pizza Hut. Still, I just... I just realized that, if Doc ever finishes with building the new time machine... Well, I'll already be... more than half a year older."

"Just relax, Cal," Marty urged, gently. "Don't forget. Doc could bring you even farther into the future, so that you can undergo rejuvenation surgery. In the end, it'll sure be as if you never even left... as if you aren't a day older. In fact, you may even be able to return to a better life. Think of it this way, Cal. You'll have a lot to look forward to."

"Well, I guess it does help," Calvin replied, sighing. "On a physical level, at least. I'll be older than my sister, which would be nice. That's a very small comfort, though, when I think of... My situation might be a little better than if, uh, you were stuck in the '50s."

"In this era, Doc will sure have an easier time building a new time machine," explained Marty. "If I was stuck in the '50s... My only option might've been to return to 1985... through the natural course of time. At least, you won't have to worry about that."

"Right, yeah," Calvin replied, nervously. The idea of that made him shudder. He hoped that his future father was correct. "In the meantime, I'm anxious for the pizza and bread sticks to come. I'm feeling hungry. I simply remember how, in my own era, hydrating a pizza was a fast process. Sure, I could have a salad bar - but I really..."

"I think that's our order, up there," Lorraine commented, softly. "It feels very strange to think that our future grandson will sure take after our son. Well, Cal, when you are finally able to return home... Well, I'm simply going to miss you. I really do love you."

"Same here," George replied, nodding. "Well, I simply must say, the whole time 'travel' thing is still a little hard to get used to. Of course, I shudder - when I think of just how my life would currently be different... if you hadn't gone back in time. It's just a bit..."

"Well, what about me?" Lorraine asked, softly. "I still can't quite get over the fact that I... that I actually just fell madly in love with... my own son. Not only that, but there's also the fact that... I had rather never considered, for even one moment, that 'Calvin Klein might've already had a girlfriend. Gee, it certainly makes me feel real ashamed."

"Don't sweat it, Mom," Marty replied, softly. "You had no such idea, and it..." Glancing at his future son and presumed twin, he added, "It just feels weird, in fact, to think of how the cycle is repeating itself. If I just ended up being stuck in 1955, I would've..."

"That a great point," agreed Calvin, as he managed a slight smile. He began to realize that, even after he finally did return to 2015, things would rather never be the same. He wanted for his father to be a happier man, but the idea still seemed a little scary.

"Just think of how it would affect us," Lorraine replied, softly. "By the time October of 1985 rolls around... Well, we'd be missing one son. It's a thought that I just... I really couldn't even began to imagine how it... Granted, 'Calvin Klein' sure would be around. If he opted to remain in Hill Valley, that is... and he turned out to... to still be alive."

"Lorrie," warned George - as he, discreetly, pointed towards the waitress approaching the table. Calvin's mouth quite watered, as the waitress set the pizza and bread sticks on the table. "I still can't believe that you kids just like cheese on your pizza, though."

"Please, George," chided Lorraine, gently - as she placed her hand on husband's arm. "Well, it's very hard to believe that tomorrow's the... Technically, I guess both of you are already eighteen. Goodness, I certainly do wonder where all the time has gone!"

"Mom!" protested Calvin, as he began to feel real uncomfortable. He, of course, didn't grow up with George and Lorraine as his parents. He smiled, just as he bit into his slice of pizza. At least, that quite seemed to taste mostly the same. "So, how about we put some music on the jukebox. How about The Power of Love? By good ol' Huey Lewis!"

"That sounds real awesome, Cal," Marty replied, smiling. "That's my absolute favourite song. Sometimes, I simply wonder if the song was written just for me." Calvin nodded, as he stepped up from the table. At least, this era had some relatively decent music.

Calvin then thought of how, at least, he didn't quite have to repeat the experience of making his parents fall in love. He had that to be grateful for - as that, in all certainty, would've been a rather tough task for him. After all, he quite used to lack confidence.

As he dropped a quarter into the jukebox, he sure began to marvel by just how much inflation had... or will have... occurred within just the next three decades. He figured that, as the price was really only a quarter per song, he would play a second song by Huey Lewis and The News: Hip to Be Square! That, in all certainty, was a fun song.

Gangsta rap was actually the one thing from his home era that he, most decidedly, did not miss. On the other hand, there were just so many other things from his home era that he desperately longed for. Still, he decided to make the most of his situation.

"I really decided to play two songs," Calvin announced, as he slid back into the booth. He then flashed a lopsided smile, as he added, "I must say, Huey Lewis and The News is about the best band from this decade. Come to think of it, maybe I'll be able to..."

"... see them in concert?" asked Marty, smiling back. Calvin nodded, as the idea simply sounded wonderful to him. "Perhaps, we could just arrange for that. After all, it would be a little something to... look forward to. Initially, this evening, Jenn and I had simply planned to catch a movie. However, as other plans came up, I just figured that we..."

Calvin sighed, as the very idea of his parents dating like teenagers still just struck him as being a little odd - even if his parents were, in fact, teenagers. Of course, just the fact that he bore a strong resemblance to his father made the concept so awkward.

He thought of his own lack of a romantic life. He knew that neither his parents nor Doc would be keen on the idea of him dating a girl from this era. While he quite understood their reasoning behind it, he still wished that he could have some romance in his life.

"Are you okay, son?" Marty asked, as he gave Calvin's arm a gentle squeeze. "I really was thinking that, perhaps, you and I could spend a little time alone - since Jenn quite has other plans for the evening. I simply think it would be a cool way to... I really was thinking that... How about going out for ice cream, and then maybe Hill Valley Park?"

"I think that would be quite awesome, Dad," whispered Calvin, as his lips curved into a smile. He grabbed for a bread stick, as he added, "I just must say, when all is said and done, there are plenty worse eras for me to be stuck in. So, all things considered..."

"... the '80s aren't so bad, right?" Marty asked, smiling. "Well, I'm just glad that you're happy with my suggestion. We could just do some father and son bonding - even if, in our current situation, you're... Well, technically, you're actually a little older than me."

"Yeah, I suppose I am," Calvin replied, softly. He had to admit that the very fact gave him a small thrill. The very concept also did seem to be a little surreal. "Well, thank you for making this a special day for me. As much as Mom can be a lot of fun to spend time with... Well, the way that she tends to look at me really... It makes me feel a little..."

"Yeah, I understand why you'd feel uncomfortable," replied Marty, sympathetically. "I mean, you look a lot like me - and your mom, because she's in love with me... Well, it'll be a... In a way, I'm sure that the situation is also somewhat uncomfortable to her."

"She seems to be doing much better, though," commented Calvin, "in that respect. I'm sure that identical twins really just have to contend with that sort of stuff, as well. If I ever have any kids... I sure wonder if I'll end up with s son who looks like me, as well."

Marty responded with a smile. As Calvin concentrated on his food, he simply pondered over how very fortunate he was. Sure, he was stuck in the wrong era. Still, there was plenty of things about the decade that he enjoyed. There was also a strong possibility of him returning home. In the meantime, he was surrounded by people who loved him.