Wife helps sister have sex with her husband

You're going to have to provide more information than this. I'm sure there are lots of stories on the site with this theme.
 
If it helps, the site will categorize such a story as incest. Sex with in-laws falls into that category, even if the theme would seem to put it somewhere else.
 
You're going to have to provide more information than this. I'm sure there are lots of stories on the site with this theme.
All I recall is this is.a series. The sister is married, but her husband's equipment isn't working. The sister is the wife's younger sibling. At some point, the two sisters do engage in invest.
 
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