searching for shounen ai

i don't remember lots but basically the pair have been neighbors for a while but don't talk much then one day one of them turns into a cat and the other takes care of him not knowing it was his neighbor as the cat and the person who turned into a cat was part of some band and the person taking care of the cat is a painter and secretly admires the neighbor. sorry if this was a bit hard to understand but thank you in advance ! <3 ╥﹏╥