GRMO-269 - Excitement! Male genitalia research target Kusano Shuji

A gentleman but a pervert! Let's develop him into a more and more excited constitution where pleasure doesn't stop. Kusano, with his muscular body and sweet face, requested development of... endless consecutive orgasms!! He reached orgasm with handjobs and various toys, achieving a personal best of 4 consecutive ejaculations!! Eventually, the sensation in his penis malfunctioned, and he had a massive ejaculation, emptying his head and testicles!!