The Spoiled Cat and the Square Darling

Tatsuo and Satoru are a student and a teacher who are also in a secret relationship. Satoru is a straight-laced literature teacher who is determined not to touch Tatsuo until after he graduates. Unfortunately, Tatsuo is all too interested in physical pleasure, and tries new ways to seduce the older man every day. One day, Satoru's beloved cat, Natsume, suddenly starts to talk! Tatsuo wants her help to take his relationship to the next level, so he reveres Natsume as his professor, and asks her to teach him how to seduce her owner...!

(Source: Renta!)

Note: Include the one-shot Now Playing (なうぷれいんぐ)