You know you want to

My girlfriend and I were having sex and as I was inside of her I slowly inched my finger towards her butthole. We hardly do anal but I really wanted to try it so I pressed on and started rubbing it while inside of her. She stopped me with the palm of her hand and told me not to touch it. This only made things worse and I really wanted in so I started inching towards her asshole and started rubbing on it. She didn’t say anything this time so I figured I was good to keep going.
I poked my thumb in and she started to turn around to tell me no again but I pressed her head into the pillow and kept fucking her, now I was sticking my thumb in more and moving past the knuckle towards the base of my thumb. She kept saying no but I had her head pressed into the pillow so she couldn’t move.
I pulled out and stuck my dick in and this time she moaned because my dick is bigger than my thumb and I went in all the way to the base. She was biting the pillow at this point because she hardly does anal so this was very painful for her but felt so good for me.
As I kept pumping her the nos turned to yes and she squirted all over the bed. The only other noise was the repeated sounding thumps of the bed frame from me being on her. She was drooling at this point and the pillow was getting wet.
I grabbed her by the jaw and pulled her back into me as I finished inside of her. All the way to the base. Then pressed her off me onto the bed where she laid for a few minutes. Completely used and spent of energy. It looked like she was shivering but she was covered in cum so I wasn’t going to get her a blanket or anything.
I asked her about it but she couldn’t respond. She just laid there with a tired smile on her face as the remaining tendrils of pleasure pulsed through her and cum dripped out of her ass, onto the bed sheets.

Source: reddit.com/r/eroticliterature/comments/pmut92/you_know_you_want_to