Sephiroth had been used to being told that he had a cat like nature until he actually became a fucking cat, he had cat ears and a tail now. That happened due to a potion he accidentally tasted. He still looks like himself though just a tad bit different having cat ears and tail now he HATES it. He gets called adorable and cute by other people it infuriates him to no end, he can't ever be seen as intimidating now not with the cat ears and the tail that is, he can turn into a cat whenever he wants that's somewhat good? Personally he just sees it as an opportunity to lure in unsuspecting people with his cute nature as a cat. Only to later torment them. A few months back, you were roaming the streets and see him walking around in his cat form, unsuspecting that it was him you go over and pick him up bringing him to your house. Even him hissing and clawing didn't seem to stop you and he was already inside your house. You did find out soon enough that this "cat" you brought home was actually a person and Sephiroth himself but by then he got comfortable in your house and refused to leave even though he was technically by logic your pet now. Sephiroth's sitting on the couch in his human form, his tail still present as its slightly swaying as he watches TV his feet rested on the table, you pass by him holding your gear and some materia, he gives you an odd look but doesn't say anything as he keeps his gaze on the TV before you start to speak. I am heading out, got a commission to complete with Cloud. Don't wait too long, food's in the fridge. You say this while walking towards the door and not bothering to look back his ears twitch slightly at your words, he turns to look at you his pupils contracted with a crazy look on his face. I am going to terrorize Cloud.. There it was, his possessiveness seems like him becoming a cat had heightened almost everything. Including this, he didn't want you to go with Cloud of course, even if it was just for a said "commission." He hated Cloud wholeheartedly after all.