I don’t have a lot of exciting stuff like this usually happen, but a tad bit of backstory:

I’ve been dating this girl for 5 years now and we’re very much in love. As fun as fantasies and porn are, I’ve never been someone who wanted to actually sleep with a bunch of different women, so I’m happy.

My girlfriend’s mom is a very classic milf. Nice breasts and good plastic surgery, plus she’s still pretty young. Besides the occasional glance and one weird incident last year (another story) I’ve never been felt weird about it. She’s kind of like a mother in law to me and I love her very much.

Ok, so the actual incident. I walked in my girlfriends house today and I could see her parents door was wide open. My girlfriend went upstairs to grab something and then I saw something move over by her parents door.

There was her mom, back facing me, wearing nothing but an very VERY small lace thong. I kind of froze. And then, the craziest part, she straight up bent over. Full on, ass in the air right in front of her open door. The door in question was around a corner from where I was, but at the angle I was at, I could definitely see.

It was only about second before I snapped out of it and realized I shouldn’t be looking. I was so scared she had seen me, but later, when my girlfriend came down, I heard her close the door, so she probably didn’t even know I was there.

I felt really terrible and creepy, but also I was so turned on. I still felt bad when my girlfriend and I went upstairs. She didn’t notice though. We start to make out and everything and I can’t stop thinking of the little show I got downstairs. I must have gotten really into thinking about it, because when I went down on my girlfriend, she came harder than she ever has before. After a little aftercare session, she wanted to return the favor.

She goes down to suck my dick and I hear “Wow. You’re REALLY hard today.”

I was so embarrassed. I know it was cause of what I had seen, but my girlfriend was so excited. As she kept going, I couldn’t stop thinking about it. Her ass looked just like my girlfriend’s, just a little more weathered. And that thong was clearly something you wear to be seen in (she and her husband were going out for date night). I kept thinking as my girlfriend kept inhaling my cock, eager to please after what I had given her.

Finally, I couldn’t take it. I told my girlfriend, “Stand in front of the door and bend over” (She has a thing for being ordered around)

“Yes sir” she obeyed (I have a thing for yes sir)

And I did it.

I railed her standing up in the exact position I had seen her mom in and we both came so hard like 3 or 4 times, I lost count. She had no idea what had come over me, but we both went primal. I growled as I watched my sexy submissive girlfriend moan my name and kept trying to suppress the urge to imagine her mother, which just made it all the more hot.

I was hoping that would be the end of it, but here I am typing this and I can’t stop picturing that round ass in its slutty thong just begging someone to come up and use it.