Walked in on my girlfriend's fling railing her on my bed

Walked in on my [24M] girlfriend's [26F] fling [28M] railing her on my bed

This happened the other day. I got home to hear moaning from the bedroom I raced in there as my heart was also racing.

My girlfriend Amanda (26F) was on the bed and her current fling Oscar (28M) was fucking her missionary style. Really intense her legs on his shoulders. They noticed me and slowed down somewhat. Not knowing what to say I asked "what's going on" to which Amanda replied "just getting fucked"
"you enjoying it?"
"Definitely" she was talking over trying to moan at the same time.
Oscar chimed in "I'm good to keep fucking your girlfriend if you want to have a seat" so I did and started stroking too as they got back into the pace. Which did not take Oscar long as he's quite good in bed and I can understand why Amanda enjoys fucking him.

He was going hard and she was crying out in pleasure and moans and came. I could see her eyes rolling back and the look on the rest of her face but he kept going and the pleasure was almost too much. She was shaking until she slumped over and he pulled out giving her a breather. He laid next to her and they started kissing. "You okay" he asked her "yeah, that was oh my God wooh" they kissed again and she got on top of him.

She went down and started sucking his cock still shining in her juices. She went mercilessly at it to thank it for the orgasm it just gave her. He got up and took her hand motioning for her to kneel down and she did continuing to suck him determined to make it cum. "Good girl" he told her as she continued until he started moaning, pulled it out of her mouth and blew all over her boobs.

There was another pause as we stared at this load he'd just shot on my girlfriend. After that they hopped in the shower together to get cleaned up.
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