This is a record of your perverted sex with the lewd lusty girls of an all girls school. As the ONLY guy... you are tasked with the duty to take care of alllll~ their pent up sexual frustrations.
The setting is a "delivery health" (dispatch brothel) service where all the girls are from "Isekai" (other worlds), and it would seem that semen is the only source for replenishing their mana in this world.
A mini CG collection featuring a girl who puts watermelons into her vagina. Genital expansion to the max! I have a pussy. I have a watermelon. Nnnghhh! Melonpussssy~♪