[Hoshino Darts] Time to Sex Goodbye (COMIC RiN 2012-02) [MrBubbles]

A boxing club captain who just announced her retirement from the team, eyeing the world championship goodbye, finds her real calling waiting at home in the form of young Takumi and his relentless stamina. One doorbell later she's drenched in his load, dragging him to the bedroom to spread herself wide and take every thrust deep into her cervix until she's sweat-soaked, gasping, and stuffed to the brim with his seed. When he asks what happens if she gets pregnant, she decides school can wait too—onee-chan belongs to Takumi now, forever, and all she wants is to be held and never let go.