Failed NNN with my first threesome (and it didn’t include my GF [MFF]

*I’m a rambler, if you just want to read about the sex scroll to the asterisks*

I’m 19, just started going to college this fall, and my girlfriend and I have been together for more than 2 years as of October. We’ve been open since just after the start of school. We’re going to the same school, and we are happy in our relationship as is, but we wanted to explore the world of dating as college students, so here we are.

I don’t think I’m great at picking people up at parties, so my go-to option ended up being Tinder (despite it being occasionally soul-sucking). I have pretty good luck, over the last few months I’ve met some pretty fantastic girls and gotten some great FWBs out of the deal.

L is 6′ tall (I’m not quite 5’10”) and somehow lucked out with a great pair of perky tits and a tight ass with just the right amount of bounce. We’ve hooked up probably half a dozen times and she is very cool and casual both sexually and otherwise. She’s a freshman like me, but luckily for both of us she’s got no roommate in the dorm.