My popular little sister has a lot of friends, and they're all cute girls! I prepared a drink with an aphrodisiac that works on any girl for the girls who came to my sister's birthday party, and when I gave it to them, they started asking for my dick, which my sister's friends thought was gross, and I ended up in a harem situation! I got a taste for it, so I started giving the aphrodisiac to the girls who came to visit my sister, and it seems that even my sister was drinking the aphrodisiac...