tipsy from a night out and laying on the sofa it began. my gf kissed me whilst her ex fumbled at my zipper. yanking down my pants my throbbing boner springs into view. bang, I feel his lips draw my shaft into the warm wet mouth. my gf has hold of my wrists as he sucks and wanks my cock. my woman enjoying what she calls the live sex show encourages me to cum in his mouth. 'good boy', as I spirt. the ex swallows and leaves followed by my girl. I fall asleep hearing them fuck upstairs. the next morn I confront my gf who told me I must have dreamt it, I think not.