Story search help needed!

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Would greatly appreciate it if someone can help me find this story. Here's a short summary of what I recall. I'm 90% sure I read here but I suppose it could've been on another site. Anyhow here's what I got:

Here's sort of o description of what it was written about.An adult son had arrived at his dad's and step mother's home. I think maybe he was visiting from college or something maybe. He was alone to start and begins to watch some videos and comes upon a fight between his mom and eventual step mom in much younger years. the step mom was less endowed than the mom and quite thin as compared to the full figured mom. In fact at the start he didn't recognize the much younger version of the step mom in the video right off. the fight took place in front of the moms husband. after seeing the his wife lose to the smaller girl eventually he realizes it was the reason his dad had married the step mom. step mom liked to fight other women to turn the husband on and she also enhanced her tits since the fight. while the son is watching the fight he's turned on despite watching his mom take a beating. before the video ends the step mom comes in and sees him watching the fight. She's no stranger to catfights or tit fights throughout her time with his dad. He never actually thought she was better looking than his mom but after watching the video and listening to her talk about it he begins to understand his dad's interest in her over his mom for the first time. she notices he's turned on and joins him in watching the fight and teases his hard on during the fight. then his mom calls and she finds out he is watching the video and rushes over to stop the step mom's use of the video to her son. a fight starts and the son watches as once again the tuogher and bustier step mom defeats his mom. the dad arrives to see what has happened and step mom takes the mom and husband to the bedroom for some more fun forcing the mom to join her ex husband with her for the night to further dominate the the mother. Again any help would be appreciated!
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