Boku no Kanojo wa Aitsu no Dorei

She's bright and cheerful, healthy looking and cute. She's a little strong-willed, but still, I'm the envy of everybody for being able to call her my most important girlfriend. Tsukasa.
In return for the liquidation of debts that her parents left behind, her kinsman wanted one thing ... her body.
Anal exploitation, cosplay, blowjob services, hidden vibrator play, exposure training, deep kissing.
Without my knowledge, Tsukasa was having sex all day and all night, gradually growing addicted to sex. Steadily, her will to resist also began to weaken.
Is it still possible to save Tsukasa from being modelled into exactly the kind of woman that HE wants her to be?

[Slightly edited from DLSite English]