A man can't sleep because he's excited by his wife's sister's sexy body. Before dawn, when his judgement is impaired, the man takes an aphrodisiac and goes on a night-time seduction! He turns over the futon of his sister-in-law, who is fast asleep, and plays with her breasts and crotch. When she wakes up, noticing something strange, he smears aphrodisiac oil all over her body! Then her refusal suddenly changes... her body heats up and her sensitivity increases! She writhes in pleasure during cowgirl sex, her shiny big breasts shaking!