This all happened when I was 23 years old and my gf at the time was 20. We had gone to a club with a few friends the previous night for whatever reason and had fun grinding and making out on the dance floor. My gf was a very sexual person and being her first serious bf she liked to check off sexual kinks and fantasies with me including exhibitionism. While we had sex she would often say picture this friend watching us or picture so and so in a threesome with us. The night draws to a close and we are drunk including a particular gf of hers that was supposed to sleep over that night let's call her Christina. Christina was a beautiful Asian girl around 5'4" with nice curves in the ass and breasts and long black hair and the sexiest mole on her upper lip. So the three of us get home and pack it in for the night all of us sleeping in the same big queen size bed. Morning comes and my gf and I are first awake, she must be feeling horny because she greets me with a kiss and a rub down of my cock that quickly gets hard. My gf was also Asian around 5'4 with some chub in the cheeks and belly, cute face but nice round behind and pretty cupable breasts with some sensitive nipples. We start making out intense now trading tongues and grabbing any body part we could. I reach down to her dripping wet pussy and she's ready to go but one problem. She doesn't want to wake up her friend that is still sleeping in the bed so she quietly guides me out the bed and brings me to the side where her friend is sleeping, bends over her sleeping body grabbing the bedframe and is presenting that cute little behind. I plunge my hard thick cock inside and she lets out a little whimper but Christina is still asleep none the wiser. I continue to pump her full of hard throbbing cock but now I have my hand wrapped around her mouth to keep her vocal ass shut while she is furiously rubbing her cute clit. I look down at Christina and she looks so peaceful but the whole scenario is just too much for me and I have to cum right there. I explode deep inside my gf's tight pussy shooting warm thick ropes until I have no more. I'm letting out gasps to catch my breath as I slowly pull out. My gf sneaks off to the bathroom to tidy up and I get back in bed waiting for her to have post sex cuddles. To this day part of me wishes her friend woke up and I wonder what could be or sometimes wonder if she was awake for the whole thing pretending to sleep.