Help finding story

[andandersman]

I remember reading a story about a wife taking her husband to a hot tub or something. She invites her mother, and the wife and her mother wear skimpy bikinis. The wife teases her husband and gets him really worked up. When he’s really turned on, she swaps places with her mother, I think the wife pushes her mom or something so she slips and she lands sitting on the husband’s lap. She accidentally grinds him till he cums.