My Friend’s Sister: Pure Looking but Actually a Cocky Brat

Synopsis

Left alone with my friend’s polite younger sister Riku at their house, we decide to play a game together. I agree to a penalty game where the loser must obey any command. Nervous, I lose the game. Expecting some cute request, she smiles and says “Get completely naked”… What?! This seemingly innocent girl was actually a super sadistic J-fashion type in disguise!

Using polite language, she makes increasingly obscene demands, and my days begin as a living dildo being drained dry. A merciless creampie punishment awaits.