I have to say that I've seen a couple of these 3 or all of them and wasn't that impressed, but I think you'll like this one:
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(Married mom vs bully, can be called son's POV) - lots of mystery-ambiguity-suspence-suspicion.
The other stories that I think were mentioned here in the tread - and/or I liked - for those who missed them or the newcomers:
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(the same author, married mom POV, series)
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stories (series 'Cucked in the Tropics', 'Cucking the Snowbound Couple', to a lesser extent - 'Cucking the Captive Campers' - both POVs for Tropics (switching), more of a male POV for the rest if I recall correctly, kind of 'good endings' in the first two. GF/Wife NTR. Lots of text - Tropics are 12-part. Some standalone works too, like 'Cheating Pool Table Slut' and I have 'Allure of the Bad Boy' pending).
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(ongoing, good rating, son's POV, Mom with fiancee vs Bully, humiliation, skimmed through first couple of chapters and liked it).
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(not on Literotica, huge - like 140k words. POV switches, interracial, but - reversed, kind of. Bully is white and your (or main male character) family is black; covered some chapters, think bully does everyone - GF, sister, mom... Whimp of a father and husband is also present. Suppose a great dose of humiliation in the later chapters).