Girls in the school's biology research club started research on "flagellar activity of sperm". The school ejaculation monitor was recruited to donate the male sperm necessary for the experiment. I was interested in how it was provided, so I went to the club room to ask ... Immediately adopted and started collecting on the spot! At first, it was about using a masturbator to support ejaculation, but the act escalated more and more in order to collect the amount of sperm necessary for the experiment ... I didn't think that science girls were such perverted girls such as Kintama massage, hidden word play, masturbation show, cosplay intercrural sex, etc., so that a lot of sperm can be made in the gold ball!