21M almost got caught jerking off with my mate’s girlfriends underwear

First time posting here and yes this is a fantasy semi fulfilled. Quick backstory, I have a thing for titty fucking and dick tributes using my iPad as a second screen to pose against the backdrop of girls nudes and then film cumshot tribute to it.

Anyway, a few months back myself (21m 6 foot), best friend (21m 5”8) and his girlfriend (21f 5”6) went away on a trip to another city for the weekend. Before going, I flirted with the idea of a 3sum but didn’t get far other than watching a brief 3sum vid with them on my phone.

I did however really want to know if I could hypothetically fit between her tits if we were to have a 3sum and I were able to titty fuck my mates girlfriend. I’d say I’m slightly above average size and her boobs are on par of average and she doesn’t have such a big ass (very petite young lady). During the trip down I was honestly so horny and wanted to compare my hard cock to her tits. And I figured the only way how was to find her bra and put it against my dick to see if I’d fit.

Well one morning, they both decided to head out for brunch and I slept in and told them to go I wasn’t feeling hungry, the only thing I was hungry for was to jerk off to whatever I could find.

They weren’t going to be gone for long as they don’t eat much, so I took my opportunity as soon as they left the apartment we were staying in. I stripped off and went straight to her suitcase to see what I could find and lo and behold I found her g strings and bras and instantly got rock hard.

I proceeded to jerk off with her bra wrapped around my shaft but didn’t want to risk pre cumming or leaving any marks on it, but still wanted to have a visual record of my size compared to her boobs. So I took a few pics with my phone basically dick tributing her underwear.

Just in the nick of time too cause as soon as I had finished taking the snaps, I heard them unlocking the door! So I quickly put her bra and underwear back the way I found it and ran to the bathroom fully naked and turned the shower on. It was a close call but dam it would have been really fucking hot to see their reactions to my hard cock jerking off to her underwear.