My sister's friend comes to our house to celebrate her sister's birthday. On the other hand, I haven't had a single friend since I was a student who came to see me! No matter how much I feel, it's too sad... This is a plan to add an aphrodisiacs to the aphrodisiacs. However, I was honestly surprised by the lewd effect of the aphrodisiac that exceeded my expectations! What's more, I can't believe I'm even looking for my younger sister! I'm having so much sex...I wonder if it's okay?