Chikan Shita Joshikousei to Sonogo, Musabori Au you na Doero Junai

The protagonist is a run-of-the-mill businessman man in his late 20s with no girlfriend. The cute HS girl he sees on the train every day. She`s well developed, with nice hips, and a healthy figure. If only he could marry a woman like her...

With that figure and kind personality, she`s given up struggling and gives into being molested or r*ped. That is all she`s known.

One day the protagonist molested her on the train. When she didn`t struggle, he brought her to a hotel for sex. This would be the first time she had normal sex. That`s when she learned how good sex can be, and he learned about her tight ass and voluptuous tits, her family-oriented and nice personality, and how she`s a dirty girl.

They fell in love with each other, and their sexapades escalated.

At home...
In a love hotel...
In a net caf?...
In a public restroom....

They didn`t think about contraception! The two lovers engaging in wild sex. "Pure" can`t describe their reveling in ecstasy while enthusiastically soaked in sweat, constantly, constantly, having sex ... whenever and wherever, if they have a minute to spare, SEX! This is a story about a couple ... that has sex for hours every day.

(Source: DLsite English)