My Wife's Secret Anal Life: Caught Red-Assed
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In secret, his wife was having anal sex with another man, but unbeknownst to her, her husband was getting turned on by the sight. Each time she returned home, she'd be sore and stretched out, teasing him without even realizing it. It drove him wild with desire, and he couldn't help but sneak a kiss on her newly acquired asshole scent.

…And there, right above the delicate lace, was a small, yet obvious, red mark.

John’s eyes widened in shock as he realized what the mark meant. His heart raced, and his cock throbbed in his pants as he took in the sight before him.

“What… what is that?” he stammered, unable to tear his gaze away from the redness on her skin.

Karen let out a low laugh, clearly enjoying the effect her secret had on her husband. “Oh, just a little souvenir from my night out,” she replied coyly.

John’s mind raced as he tried to process what she was telling him. His wife was having anal sex with someone else, and she was teasing him with it without even realizing it. The thought sent a shiver down his spine. It made him jealousy and angry, but also made his mouth water with anticipation…

Finish here ;) https://www.redquill.net/story/37mr6n