[Main story with face revealed] My sister came into my room saying she had something she wanted to discuss with me. It seems she was worried that her pussy lips were bigger than most people's. "I don't understand even if you explain it to me..." I replied coldly, but she actually showed me! "H-How is it? Is it bigger than normal?" My sister looked anxiously at me as I stared at her pussy. "I wonder, can I touch it a bit?" Secretly getting an erection, I pretended to give her advice and escalated the act. Three beautiful-pussy sisters included!