Doctor x Patient love story. Kaname is a good looking and popular virgin who's having problems having sex due to his XL penis. He has had girlfriends but they eventually leave him out of fear of his huge penis. One day he finds a flyer about a sex consultation therapy and meets the promiscuous doctor Minato. Minato is amazed with Kaname's dick and offers to help him. They eventually have sex but since their relationship is for "sexual therapy" they part ways after having sex. Kaname realizes that he can't do it unless it's the doctor and Minato also feels the same way.
Story is kinda shallow since it's more on playful sex and the uke is kinda loose.
Kimi wa Kokan no Mochigusare