There are many different X-Men lineages. There is the comic book lineage, the fantastic cartoon show, the movie, and the new cartoon show that follows depicts the characters as teens. This story will follow the version I know best, the movie. I may make some changes in character inadvertently. If I do, I apologize.
Logan sighed to himself. As he looked into the icy snow before him, all he could think about was his past. He thought about meeting with these "X-Men" and saving the world from Magneto. He was happy to do it, as deep down he really was a good person, but he still hadn't remembered who he was. That's why he was here in Canada. That search had consisted of 5000 acres of wilderness near an abandoned laboratory. In the month he had spent in the cold, he had found very little to remind him of his past. In essence his past was still a closed book. Shaking is head; he decided to return to the only place that had actually felt like a home to him in the last fifteen years. Thus he was heading back to Westchester County.
Logan arrived at "Xavier's School for the gifted" at about 9pm. He walked in and headed to the room that he had used. He saw the card that Rogue had made for him and smiled. He flung his duffel bag onto the bed and headed into the kitchen to fix himself a quick sandwich. What he saw upon entering made him smile.
Storm and Jean were laying naked on the kitchen table doing a hot and steamy 69. "Well Logan old boy, looks like YOU may be the sandwich tonight" he said to himself with a smirk. As the two ladies groaned, Logan removed his clothes so that he was standing, dick in hand behind Jean. All of a sudden, he plunged a finger into Jean's ass. Jean froze with terror, until Logan spoke and comforted her. "Sorry Dr. didn't mean to scare you, but you seemed about a quart low!" Jean turned around, and smiled. "Good to have you back Logan. But there were others ways I wanted to welcome you back, but I guess this way will do."