My girlfriend asks me to deliver medicine to her adult sister Sumire, who is sick in bed. I enter nervously and find her asleep with her panties exposed beneath her skirt, the fabric wedged tightly enough to show every outline and make me hard. When I visit again, Sumire reveals that she recorded me staring. With that leverage, her teasing demands keep escalating until I repeatedly have sex with her and creampie her behind my girlfriend's back.