Need help finding a story...

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I'm looking for an incest story that I read quite some time ago, like a few years...

It was about a brother who spied on his sister having sex with her boyfriend, but the boyfriend wouldn't let her swallow his cum. The sister has a cum-tasting fetish, and so when she catches her brother spying on her, he convinces her to blow him so she can eat the cum she desires.

Thanks if you can find it...

 

[Hotcappucino]

...but the boyfriend wouldn't let her swallow his cum.

The story has a guy who won't let his girlfriend swallow his cum??? Now that is stretching reality...

No luck finding it so far, unless you remember any other details.