[Sadagorou] Coerced Coitus Contract (Web Manga Bangaichi Vol. 26) {Doujins.com}

Kanae will do anything to keep her beloved Eisuke out of trouble, and the contract her imposing senpai holds over her makes sure she pays in full — summoned to the school showers, toy hidden beneath her uniform, servicing him while her crush trains just outside. When a beach date finally lets her give her virginity to Eisuke, her big breasts heaving under him as they become lovers, she discovers the senpai's conditioning has left her body aching for something one tender night can't satisfy. As Eisuke innocently thanks the very man stealing his girlfriend, Kanae kneels with a scarf clenched between her teeth, ahegao washing over her face while jealous whispers beg to share even a little of her happiness.