My best friend (a virgin) came to my house with his girlfriend! Moreover, she's a slut and not at all satisfied with my best friend's immature sex. She tempted me by showing me her panties or playing with my crotch when my best friend wasn't looking! I thought, "How frustrated can you be?!" and I, who always loses to temptation, ended up having sex. But at least at the end, when I tried to take it out for the sake of our friendship, she did a crab claw lock! Oh no! If I cum inside, I'll really become a piece of trash.