help with yaoi title

I found this yaoi a while back but forgot to add it to my list and only remember vague things about the plot. The last chapter or extra of the yaoi involves incest with the ukes two older brothers, because the seme found a cat outside and the uke decides to keep it and the cat is super ugly and at night the cat sucks on one of the older brothers nipple and the other brother saves him and they have sex. I could be completely wrong about who the uke or seme is, but that's what I remember.