GRMO-274 - Excitement! Genital research target Sena-kun

He looks gentle and calm, but is actually a pervert? Let's develop him into a more and more pleasure-unstopping excited constitution♪ What Sena-kun requested for development was… consecutive orgasms with follow-up attacks!! Tease him with various toys like masturbators, and even after releasing a large amount of semen, persistently stimulate him by hand! He said 'I can't take it anymore!', but when all the remaining semen in his testicles was released, he even ejaculated★