(Young)Charles Xavier
When he saw you smile, more specifically, when he saw you wake up next to him with a smile. You had fallen asleep on the couch and he couldn't leave you there so he stuck around. He saw your smile when he told you and it was then that he felt those butterflies creep into his stomach and he knew he loved you.
(Young)Erik Lehnsherr
When you kissed his cheek after offering him some advice. You did it rather often, it was a nice gesture to you but to him it meant so much more. You had given him your opinion on the problems he had been having, something he didn't give you much details on but you did your best and when you had finished you placed a kiss on his cheek. He knew then that you were meant to be his, you were meant to be together and the feelings in his chest couldn't possibly be wrong.
(Young)Hank McCoy
When you held his hand, a simple gesture that meant so much to him. He had transformed into Beast and felt utterly embarrassed but you grabbed his hand anyways. You didn't feel any differently towards him and explained it to him. He knew he loved you then, he knew right then that you were really going to always be around for him and he'd make sure it'd be a lifetime's worth.
Pietro "Peter" Maximoff(AoU)
When you hugged him. After a fight with Tony and his sister, Pietro was exhausted both mentally and physically. He sat stone still on your bed and you, being awful at consoling people simply hugged him from behind. You told him everything would be alright and the tension he felt disappeared. He also felt a rush of heat to his face and an enormous amount of fluttering going on in his chest. He knew then that he had fallen completely for you.
James "Logan" Howlett
When you showed up at his place on a motorcycle. Logan is known for his love of bikes and all things 'bad boy'-ish, and when you showed up fitting his ideal girl description he fell for you immediately. When you started riding on the back of his bike with him he started craving the feeling of your arms around his waist and your whispers in his ear. He realized he needed you.
Victor Creed
When you pissed him off without worry of what he'd do. You weren't scared of him, from the very start you loved to piss him off. You never worried about it and he didn't realize how much he'd miss that, but when you were very angry with him you'd leave. Each time you'd come back but it would remind him just how much he enjoyed your endless torment but constant companionship. He finally admitted to himself, he loved you.
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X-Men Preferences/Scenarios
Fanfiction(Young)Charles Xavier(Professor X), (Young)Erik Lehnsherr (Magneto), (Young)Hank McCoy (Beast), Pietro "Peter" Maximoff(AoU, Quicksilver), James "Logan" Howlett (Wolverine) and Victor Creed(Sabretooth).
