[MFM]Shared my Girlfriend with my Gay Roommate and his Boyfriend

I wanted an apartment closer to my work and the only accommodation I could find was a small two bedroom apartment. The occupant of the apartment wanted someone to move in to split rent and I hated the hour long commute to work, so it seemed like the perfect fit. We met briefly for coffee to go over ground rules. He was a cool guy and told me he was gay and often had his partner stay the night. I was okay with this so long as my girlfriend was allowed to stay the night as well. Although the apartment was small, it had two separate bathrooms so we had a little privacy.