[Reducing Mosaic]MFT-005 I heard that the biology research club was recruiting sperm for an experiment, so I went to check it out and got hired on the spot. Then a cute female science student kept milking me! 'Can't you shoot a little more?' They fucked me until I couldn'

A study on "sperm flagellar activity" started by the girls in the school's biology research club.
Male sperm donors were recruited for the experiment needed for the experiment.
Curious about how to provide it, I went to the club room to ask…
I was immediately hired and started collection on the spot!
Initially, it was said that an onahole would be used to support ejaculation, but in order to collect the amount of sperm needed for the experiment, the act escalated more and more…
To produce plenty of sperm in the balls, there were ball massages, dirty talk play, masturbation displays, cosplay sex without penetration, etc. I never thought that science girls would be such perverted girls!!