Looking for an older story where girlfriend fucks boyfriends dad in front of him

It’s an older story. Told from the boyfriend’s point of view. They’re by the pool and she starts teasing the dad and eventually fucks him in front of the boyfriend
To add a little more detail I’m pretty positive she starts grinding on him or sitting on his lap and he tells her how inappropriate it. By the end she tells him she’ll come back over to fuck him tomorrow and the dad tells his son “it’s for the best if we don’t tell your mother”
 
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