Senpai no Idenshi, Ore ni Choudai?

"I wanna see your face when you cum." He fondles my sensitive penis with such fervor and dedication, as if to milk me for every last drop! Is this really only for the purpose of our experiment? Nozomu and his junior partner, Saki, are known at their college as the "rising stars" of their laboratory research group. But, the day before a report is due, they accidentally shatter all of their test tubes containing vital sperm samples! Just as Nozomu is about to be consumed by his despair, Saki proposes the idea to use their own sperm... Saki's masterful hands drive my tired body to climax against my will... this younger student is going to steal my virginity!!

(Source: Renta)