My stepsister, who was born from my parents' remarriage, is incredibly cute, a bit timid, has a slight masochistic tendency, and is unbelievably erotic! She's so defenseless that every day I struggle to find a place to look, whether it's her panty flash or nipple peek, which always leads to an erection. So, I decided to boldly ask, 'I want to do irrumatio,' and surprisingly, she agreed! When we started practicing hard piston irrumatio with her mouth down to her throat, her panties were so wet they developed stains! She transformed into a super lewd girl who demanded my just-shot-in-the-throat dick, 'More, more!' and wouldn't let go of my dick!