18+ Joshiryou Neko no Tama-san

One day, a little gray cat is abandoned at the entrance of a girls' dormitory. One of the girls, Himari, takes him in and gives him the name "Tama-san" or "Balls," owing to his rather prominent testicles. Thus begins a sexy new chapter in his life, from the streets to the sheets!

(Source: Seven Seas Entertainment)