Furueru Kuchibiru: fuzzy lips 1

An unsatisfied young woman named Katakura Kon has entered into an ambiguous but highly sexual relationship with her homeroom teacher. He rarely attends school and continues to live with the teacher, but no one is willing to explain their feelings to each other. frustrated overload, however - and even when dating, they can not communicate enough without sex!

(Source: Nekopoi, translated)