Totally Defeated Sister. There Is No Way I, A Former Undefeated Mixed Martial Arts Champion, A Calm Powerhouse, Can Be Defeated By A Bristly Brat. Hibiki Otsuki

Former martial arts champion and now full-time housewife, Otsuki Hibiki. She challenges the neighborhood brat Yuto, who walks around at night, to a martial arts match, saying 'If you win, you have to listen to me!' Losing the match and frustrated, Yuto secretly spikes Hibiki's drink with an aphrodisiac and challenges her to a rematch. Unable to use her strength due to the aphrodisiac, Hibiki loses to Yuto. Hibiki challenges Yuto again, but he says, 'If you cum, you'll be my slave,' and she is made to cum repeatedly from the aphrodisiac, becoming his obedient slave from then on.