[Bitch Goigostar] Akaneiro ni Modaeru Hitozuma - Wife Writhing in Madder Ch. 1-3 {Doujins.com}

Securing her son's spot at a prestigious school was supposed to be simple volunteer work—instead, a curvy housewife strikes a deal with the staff that turns her massive breasts and lush body into currency. Passed between grinning teachers, strapped into machines with extra-thick vibes buzzing in both holes until she begs to give up, and shared at swinging parties right under her husband's nose, her 'punishment' only gets started no matter how much she squirms. And when spring's entrance ceremony proves the sacrifice paid off, her volunteer work continues as a freebie for the wonderful teachers who took such good care of her.