[Kakurenbo (Rainbow-zou)] Onee-chan no Semen Server

A boy's sticky-fingered moment with his stepsister's panties lands him squarely in her debt, and she names her price: total obedience. With their oblivious mother humming away in the kitchen, the busty onee-chan collects her payment anywhere she pleases—milking him under the dinner table, riding him breathless in bed until her huge breasts sway with every thrust, and pressing her pantyhose-clad foot against him over curry while he squirms and blushes. What starts as blackmail melts into a daily routine of teasing, servicing, and surrender, as this smug big sister turns her flustered little stepbrother into her personal semen server.