i did the most naughty thing

so my bf and i were at a hospital event where he was volunteering as a phlebotomist and there was this super hot nurse who worked nights and she had that whole sexy medical vibe going on. we were having drinks and talking and i swear her eyes were kinda on me. when it came time for a break, my boyfriend said let's go to the supply closet cause its empty rn. and i knew what he meant. so we go in there and start making out, hands all over each other, feeling up the scrubs...and then it got serious. i straddled him right there on some boxes of gloves and started riding him, his penis sliding inside me against my panties. she walks by just as i'm about to cum really hard, like shes seeing us clearly through the open door but not wanting to interrupt. after that we quick cleaned up, went back out pretending nothing happened but i know her knowing look meant she got off on it too and was thinking naughty thoughts of me.