The woman, drugged and pleasured by her boyfriend's sister while being played with in the kotatsu, experiences an unforgettable orgasm. She relentlessly pursues the woman who engages in drug-induced lesbian sex. (NHDTB-860)

The first time I was introduced to my boyfriend's sister, she fell for me... After we sat down at the kotatsu, she moved closer to me! Avoiding my boyfriend's gaze, she secretly used fingers coated in aphrodisiac to play with her genitals, causing my body to undergo strange changes! Although I hated it, I experienced repeated orgasms, making me want even more pleasure and beg for more aphrodisiacs...