Overview: While the protagonist is left alone while his parents are away on a trip,his sister comes home with her girlfriends,who are rumored to be super sluts! While the protagonist is upset by his sister's big-breasted friends,his sister tells him,"You can do whatever you want with them!" The protagonist becomes extremely excited as he stares at his sister's slutty friends making dirty jokes one after another,and he mistakenly thinks that he can have sex with anyone,which makes his fantasies and groin swell. In this unbelievable heaven-mode situation,the protagonist's rampage knows no bounds,and he immediately inserts himself into his sister's slutty friends one after the other! A harem fantasy of "I wish something like this could happen" with a series of unexpected lucky lewd encounters!
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