I was unexpectedly taken a liking to by my boyfriend's sister who was introduced for the first time... A girl who comes close while I'm in the kotatsu! Sneakily receiving hand job with fingers smeared with aphrodisiac while stealing a glance at my boyfriend, and a strange change occurs in my body! Although I should dislike it, I'm completely overwhelmed... I beg for more aphrodisiac to feel even better!! Rationality flies away, and I drown in lesbian pleasure that I couldn't experience with my boyfriend's sex!!