Just started cheating on my Gf with my ex | 2016

So a few days ago my ex contacted me asking me to help her out on her financial aid, so i decided to help her. We met at a library not too far from my families property and got everything settled after an hour. She offered me a ride home and after i invited her in for some drinks. We started talking and joking around and i said "you really owe me big time for this" She smiled and looked at me and asked what i wanted. She kept looking at me and said "i know what you want" and put her hands on my crotch ad we started making out. I grabbed her ass and she looked at me and said "Is that still yours? Prove it." I laid her down on top of me and kept smacking her ass. She stopped kissing me and unzipped my pants and started sucking on my cock. Her mouth just slid up and down it like this was her job. Next, i got up laid her down and went down on her. Her clit was so wet it was nearly dripping. I put on a condom and started doing her missionary style. She was moaning so loud i could barely understand her while she was telling me to let her ride me. She hopped on and leaned forward so we can continue making out. As she was riding me she told me to keep spanking her. Grab and spank, grab and spank, her ass was too good to pass up a good spanking. Soon we both cummed and she said we should do this again. At first i felt really guilty for cheating, but the more i thought about it, the more hot it sounded. My ex is also in a relationship so i kind of find pleasure in fucking my taken ex. We hooked up again today if it catches anyone's interest ill post that story as well.