Disclaimer: I do not own Back to the Future.
Marty's adventure to the past changed the course of time in not-so-subtle ways, but the biggest change is not in the way it's been rewritten. It's in the way the Marty who'd experienced seventeen years of life before that adventure was changed during it.
One week, sixteen hours, and four minutes ago, on this exact date--October twenty-seventh, nineteen eighty-five--his girlfriend, Jennifer Parker, was the only one he really had eyes for.
That was before he met Lorraine Baines. The seventeen-year-old version of his now forty-seven-year-old mother.
The year was nineteen fifty-five. A simpler time, his parents would always and will again say when old enough to be his parents.
Upon waking up from what he figured to be a nightmare, Marty called out to his mother in a weak voice, and it answered him. Comforted him. Assured him he was in the right year. Nineteen-fifty five. Instantly, Marty's eyes flew open. That was not the right year at all. This was not a dream. Fear coursed through him as the bedside lamp was switched on, and there sat seventeen-year-old Lorraine on the bed across from his. The thought that went through his mind second to the fact that this was his mother, was that she was hot, and he almost blurted it out before that first thought ran back through. She kept calling him Calvin, as in Calvin Klein; the name written on his underwear, which was all he had on besides his t-shirt. She'd taken off his pants. They were on her hope chest, she said, pointing toward it. She then vacated her place on the opposite bed to sit way too close to him on his own. It was obvious that she was coming onto him. The woman who'd always portrayed herself as so innocent and frankly prude. It all seemed like overcompensation now for whatever hungry vixen was looking at him with such lust in her eyes. Fortunately, a blanket covered his lap, because he was starting to physically react. The closer she got, the farther he backed away until he actually fell off the bed.
Throughout his entire mission of getting back to the future, Marty had to suffer the side quest of ensuring Lorraine would come to fall for the boy that would someday be his father, George McFly, which wouldn't have been a predicament if she'd never fallen for Marty in the first place.
There were five reasons Marty couldn't give in to Lorraine's advances. The first, being that he'd disappear from existence, along with his brother and sister, Dave and Linda. The second, that his parents simply wouldn't be able to fall in love. The third, that several other aspects of history could be affected. The fourth, that he'd be cheating on Jennifer, though she hadn't even been born yet. Last but not least, the fifth, being that Lorraine was his goddamn mother. Honestly, that was more important than any of the other reasons, including the first. He'd rather disappear than live with the shame of being intimate with her on any level. Boy, was the temptation hard to resist at times, though. Harder than it should've been (pun intended).
