He smeared aphrodisiac on his sister's high-cut swimsuit, then repeatedly pressed his large penis against it with his legs... before slipping in without a condom! The result was a 100-fold increase in sensitivity, causing her body to arch backwards and experience multiple orgasms, leading to 16 ejaculations inside her. (Kuramoto Susumu HMN-914)

My girlfriend's younger sister is a sunny and cheerful but incredibly arrogant girl. Every time she sees me, she looks down on me, saying I'm "not good enough for my sister." Until one day, she wore a high-cut swimsuit for a beauty pageant swimsuit audition… and she was smugly mocking me, pushing my patience to the limit! I secretly smeared aphrodisiac on her swimsuit and retaliated with a leg-to-leg thrust, pumping wildly! "How could a sullen man's penis possibly arouse me…" I forcefully rubbed my legs together, making her vagina incredibly wet! The friction of the high-cut swimsuit amplified her sensitivity a hundredfold! Finally, I slipped into her soaking wet vagina without a condom!! Because she had been so intensely aroused, she immediately orgasmed! Then came an incredible, raging torrent of 16 internal ejaculations!!