DSVR-1882 [VR] [8K] My sister can't orgasm during sex with her boyfriend, so I took responsibil

My rebellious little sister seemed to be worried about something. Even though she was annoying me, I listened to her and found out that the sex with her first boyfriend wasn't going well. She was crying, worried that she might get dumped if things continued like this, so I, her older brother, decided to step in and help her out! "What? With you, damn big brother? What are you talking about? It's disgusting." At first, my little sister was reluctant, but for the sake of her boyfriend, she wanted me to tell her all sorts of things. She also had her cute side...