Jill let it slip

Im always fantasising when im having sex and I have to be aware of as im always thinking of others when I'm fucking. This all started because of Jill, we had been seeing each other for around 6 months and the sex was fantastic (isn't it always at the beginning?), my cock was hurting me it was that hard, my cock was going in and out of Jill like a piston on the Titanic, Jill was trying to hold my pelvis to stop me thrusting so deeply inside her, she let out in an almighty screen 'Jason' (her ex), I stopped for a moment, Jill opened her eyes and said "what's wrong"? My cock and the bed was covered with Jill's cum and now I was wondering if all the times we had been having sex Jill was thinking of her ex? I then strangely got turned on the more I thought about it and I thought well if Jill can think of others so can I. I never mentioned it to Jill after that but I'm sure that she, like me has her own little fantasies playing in her he'd as we are fucking!