Her best friend is a slutty older sister who gets excited about cuckolding. She doesn't care that her girlfriend is right next to her, she shows off her boobs and begs for sex! What's more, she's OK with raw sex! She's OK with cumming inside! She's a forbidden partner that you shouldn't have sex with, but when a woman like this tempts you, you can't resist! The Kokoro of immorality and guilt become a source of excitement during sex, making you feel even more erotic!