Recently, my girlfriend's younger sister has become attached to me. She's so cute and seductive that I'm at a loss for words... "Your boyfriend is so cool, I think he's Mia's type." She shows off her underwear so that her girlfriend doesn't notice, touches my penis... When we're alone, she's all lovey-dovey and clingy! "It's okay! She doesn't notice," she secretly opens her pussy and inserts it to appeal to me! I can't resist her devilish temptation, so I'm having sex with her again and again!