[M] [MF] start of an open relationship

I’m a long time lurker on this sub, been waiting for the right time to post here and I think this is finally that time.

**Background:** Me (18M) and my girlfriend (18F) have been in a long distance relationship for a couple months now and things were going alright trading nudes back and forth, video chatting every so often, but we were both still soooo horny without real sex so we decided to make it an open relationship. This is the story of the first time she fucked another guy and I was surprisingly turned on by it.

So there’s a guy in her class we’ll call him Jeff, and one day he comes right up to her and says “I really want to have sex with you” my girlfriend we’ll call her Sam, is really surprised by this she takes a little too long to respond Jeff says “sorry if that was rude” and walks away. Sam goes to her next class and messages me that story and follows it up with “babe I really need to get fucked right now” I respond with “well then ask that guy to take you home tonight.” She accepts Jeff’s proposal and messages me that they’re on their way to his place and she’ll tell me what happened after.