IENE-637 Out of pity for miserable me, my best friend's girlfriend agreed to let me 'grind' against her and do some dry humping. But we both got too into it, and her pussy was soaking wet! So I just slid right in! "What?! It's inside?" But I couldn't stop

I was miserable when it was reported that a female friend who was secretly in love with my best friend was dating. My misery is only getting stronger with these two people who don't care about me. In the midst of this, my girlfriend's best friend decided to go out and I was alone with her, so I tried to play a prank on her, but I failed. It made her feel awkward, and I thought I couldn't do it anymore, but she said, "I'm her best friend's girlfriend, so I can't let you in, but it's okay if it's just a costume." ?