I was liked by my girlfriend's younger sister, so even though she was nearby, I was at her mercy. She secretly kissed me so that she wouldn't find out, and before long, we were in a relationship that went beyond that... "You'll get caught by your older sister, so be quiet. I was completely captivated by her devilish smile and persistent tongue, and we ended up having a deep, passionate, seductive, tongue-kissing sex NTR.