In order to make the beautiful aunt I admire, I, a medical student, use my knowledge to create an aphrodisiac. And this summer, I will be staying at my girlfriend's aunt's house, and the time has come to try out the aphrodisiac. I kept increasing the amount little by little, one drop, two drops, three drops, four drops, without my aunt's eyes. Her body is flushed, her breathing is ragged, and her aunt, who twists her body, seems to be going insane. After 10 days, her aunt, who had finally lost her mind, attacked her. Then my aunt became my obedient meat urinal...