Onee-chan no Tomodachi ga Kyou mo Ore o Batsu Geemu ni Tsukau.

My sister’s friends are so gorgeous they’re known as the school’s “Four Goddesses.” But behind closed doors at our house, they reveal a much more mischievous side. Every day is a struggle as they tease me with provocative and slightly lewd punishment games. Just how much more of this “stimulation” can I take?!