My girlfriend's younger sister is a landmine-type female student with huge buttocks who likes to have deep throat orgasms from large penises, swallowing and spitting out semen. (Masako Rina LULU-331)

My girlfriend's younger sister, whom I met for the first time, is a yandere/J-type character with a dangerous personality. Taking advantage of my girlfriend's absence, she revealed a peculiar fetish—a sensation deep in her throat—and seduced me by touching it with her fingers. As if mocking my confusion, she pulled down her underwear and took my penis into her mouth! Suddenly, my penis was thrust deep into her throat! I experienced self-pleasure for the first time ever; it felt so good, I couldn't hold back, and finally ejaculated into her throat, making a sound as she swallowed! It seems my sister developed an interest in large penises. From that day on, I secretly made her perform self-pleasure and swallow my semen multiple times.