Lending out my (18) girlfriend

My gf and I have been together for almost 2 years now so I have met her father and his friends and stayed over at their house often

I’ve seen the way his friends look at my gf and it used to make me very jealous

Her father is often out of the house, which is good for us because we get to fuck a lot and be loud

But one night her father had a couple of his friends over and we had all been drinking but her father said he ‘had to go’ and left his friends with us

Being tipsy, my gf was wanting to dance with me, she was grinding on me and getting low and I could see all of the guys staring

I got slightly jealous again and started to be all over my gf, I was grabbing her ass in front of them and letting my hand slide up her top too

After a while she took me by the hand and we ran off to her room and she sucked my dick but I did not last long so we were back down and dancing soon after

Maybe it was the alcohol but I had a sudden exiting thought and waved over to the guys to get their attention.

I pointed at my girl and then gave them a thumbs up, they smiled and gave me a thumbs up too but I knew they did not know what I was suggesting

Again I pointed to her and then I pointed to them and gave my thumbs up to them, they looked confused and just smiled and put their thumbs up to me too

This time I squeezed her ass and raised my eyebrows at them and pointed over to them again.. this time the guys suddenly looked at each other and quietly said something before one of them looked back at me and nodded and put his thumbs up

I slowly took my gf over to them and literally placed her on the lap of the guy who nodded and he put his hands on her hips as she sat on him

I sat with them and made idle chatter before saying I’m going to the toilet

I was gone for maybe 5 mins and when I come back she had her arm around him and he had his hands wrapped around her stomach

I came back and sat with them and chatted with the guys like everything was normal

I saw his hands moving around and feeling her and he slipped his hand up her top and she gasped but I ignored it and continued talking with the guys

We could all see him playing with her boobs and she was starting to twitch and grind and bury her head in his neck until she hopped off his lap and said she had to go to the toilet

But she waited by the door..

I hit the guy playfully and said ‘go on, go ahead with her’ he nervously looked at all of us but slowly got up and followed her out of the room

I was really jealous and slightly annoyed but I acted like I didn’t care and continued to talk with the guys

But after a couple of minutes our talking got quieter because we could hear a slapping noise which was obviously his pelvis slamming into her