Bijin na Jun-kun no Dekiai Shidou

Synopsis

Don't touch in that weird spot." "What the weird spot?" As he says that, Jun-kun is relentlessly messing with my sensitive parts... Sachiko, who got drunk after being ridiculed for her lack of femininity, decided to ask Jun, a boy who is more beautiful than the girl there, to receive guidance on improving her feminine wiles. But as a condition, Jun will have to live together and touch Shoko's chest... Her body will be developed by the naughty doting guidance of the handsome younger man. (Source: AniList)