Sephiroth is a wounded man, he has his secrets, his traumas, his goals. Like any other man he lives, though he hates that aspect, he hates that normal, until it comes to you. He's a murderer, he's killed thousands, and yet he finds solace in a little pub five minutes away from his 'home'. He finds solace in you, sweet, innocent you. The dark part of Sephiroth wants to corrupt that innocence, he wants to ruin you beyond repair, but at the same time, your kindness and caring nature heal him.