I went to a bar with my then partner and his roommate Steve. Around 3 AM we all stumbled into my partner's apartment. My boyfriend promptly passed out, leaving Steve and I to ourselves on the living room couch. After a few more drinks and some flirting, Steve and I had some drunken sex on the couch. The next morning, there was a huge stain on the arm of the couch from where Steve had overshot his target (my mouth) and had sprayed the couch with his cum. He explained it to my boyfriend as the result of a late, late night bootycall.