~A certain academy's field study~
The isolated island owned by the academy has a few villages. Students are ordered to come into contact with all the islanders and perform sexual services.
Among the islanders, there are around 800 virile men. Until the students have serviced every one of them, taken semen from each man into their bodies, they are not allowed to leave the island.
They are told by the islanders full of desire to be quiet as they are fucked, but the problem is opposite... The islanders are weak to desire.
They are young boys even younger than the students, and old men with weak bodies, who have to ask if they can cum.
That considerably wounds the girls' conceit, as well as showing plenty of effect in reaffirming the males' existences.
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