
I FUCKING FOUND IT!!!! BY RANDOM CHANCE!!!!!!
http://www.mangago.zone/read-manga/bachi_bachi_kijima_hyougo/tr/114179

I read this mama a while back and there was and extra story in the last couple chapters... BUT I CAN'T REMEMBER THE FUCKING NAME!!!! I don't remember the main story just the extra. It was just a smut chapter but it was really cute. There was a cat boy and a dog boy and this other dude. Cat boy was a douchebaggy cat and dog boy was a loveable lil pupper. PLZ HALP ME FIND IT AGAIN!!!
Not sure if this is what you're looking for but this is similar sooo XD
http://www.mangago.zone/read-manga/after_morning_love/mh/169774/Vol1_Ch5-9/pg-1/
I FUCKING FOUND IT!!!! BY RANDOM CHANCE!!!!!!
http://www.mangago.zone/read-manga/bachi_bachi_kijima_hyougo/tr/114179
Literally fuck Matthew he's an abusive piece of shit. A sad backstory is not a free pass