Ranko Asahi's Manga List

"Hah, you came. How pathetically cute!" The gentle teacher from my cooking class is a lightweight who turns into a sadistic stud when he gets drunk?! Hotaru, who is uncomfortable around men to begin with, is touched on the train during rush hour. Just then, a handsome man named Satsuki intervenes to help her, and it turns out that he's a teacher at the cooking class Hotaru was planning to attend! While she was initially concerned about having a male teacher, Hotaru is reassured by Satsuki's gentle nature. However... after taking a bite of liquour-filled chocolate, Satsuki's attitude does a 180! Suddenly, he pulls Hotaru into his arms tightly and kisses her. "Take everything off... Spread your legs, I want to see more..." As Hotaru continues to follow his demands, her novice body, which is yet to experience pleasure, begins to change...

A girl appeared before him one day, wearing a collar and leash. He considered turning her away, but instead gave her the name Kuro and kept her as his pet.

At first, he assumes she has been put up to it as part of some role-play with another man. However, as they spend more time together, the situation escalates, and he begins to see her as his own personal submissive dog.
After training her clitoris with his fingers and vibrators, he takes her out for a walk, leading her by a leash attached to her enlarged clit. When they encounter two strangers, an orgasm endurance game begins.
Kuro loses despite knowing the stakes, and they record her vulgar orgasms in the middle of the street...