"I have to make sure he's the right boyfriend for my sister!" One day, my sister brought her boyfriend home, but I didn't get a good impression of him, including his appearance! "What's so good about this guy?" I thought, so I decided to try out various things to determine whether he was the right boyfriend! First, I twisted her nipples 360 degrees from behind, concentrating on stimulating them! Then I whispered dirty words in her ear that made her brain melt! Then... she writhed in agony and ejaculated instantly! "You're so mean, you're feeling so much even though your sister is right next to you!"