[Small Marron (Asakura Kukuri) Seikou Hiwa ~Kareshi Mochi no Watashi ga Toshishita no Otaku ni Otosareru made~ [Full Color] {HMC Translation}

A devoted track-and-field senpai with a boyfriend, a plump athletic figure, heavy breasts and a beauty mark, gets steadily corrupted by her scheming junior otaku after one spur-of-the-moment hookup she can't stop replaying. Between grueling club practices that leave her sweating and tingling with guilt, he tightens his grip, coaxing her into rolling a condom onto him with her lips while she insists it was only a one-time thing. Watch a tomboy athlete lose ground to the one junior she swore she'd never date, her resolve eroding with every encounter.