"Seishi Touhyou ~Miseshime no Meyasubako~"

This academy has a unique activity called "sperm vote" that functions to impose
penalty on cocky female students and give male students sense of superiority.
In sperm vote, three selected female students come on the stage.
In three days of election male students are allowed to have sex with them
and an internal cumshot is regarded as a vote...

Only the principle of the academy knows what will happen to the elected one...

[From DLsite English]