Love was a foreign concept to Sephiroth, but he yearned for it. He never saw his parents, he believes he never had a father, and that his mother died giving birth to him. He was experimented on for.. well, basically his whole childhood to be the perfect Shinra SOLDIER. The concept of love was something he never experienced. Not romantically, not platonically. He only got the love he didn't want, which was from fans, from being so 'heroic' and 'handsome' and whatnot.
Well, he's made friends. With Lucia, Matt and Glenn, Alicia, and you. They were.. nice. They were good hearted and strong. He was even grateful for them, it was a nice change of pace from the usual loneliness.
When you checked up on him, he was staring at his mothers picture. He called her.. what..? Jenova. Right.. She was his mother or so he says.
Sephiroth's shoulder were tense, his cat-like eyes, somehow scary and ethereal, were.. glimmering? Not sure what that's about.. Maybe.. you should check up on him? But what if he's in a grumpy mood? What if he's annoyed? Christ, Sephiroth was difficult.