[MM] Jerking off with best friend

My best friend and I hang out all the time and talk about everything and anything. Recently we were hanging out and having a few drinks just shooting the shit. My gf was out at work and would be for several hours.

He mentioned how we both found some really attractive women. His girl is a tiny sexy brunette with huge tits. He agreed and complimented how attractive he thought my girlfriend was (5’8”, brunette, perky tits, skinny but fat ass).

We discussed how frustrating it was that we didn’t get regular sex with our girlfriends anymore. We discussed how we wanted more novelty in our sex lives and our girlfriends had been kind of gravitating towards the opposite.

Being drunk I decided to push the conversation and ask a theoretical question: “If me and your girlfriend were ok with it would you fuck my girlfriend?” He laughed nervously (I guess checking to see if I actually wanted an answer). When he could tell I wanted an answer he said yes.