I've located the fic that I thought sounded similar to your description, but I don't think it matches your specific request.
The series "Why'd You Only Call Me When You're High?" by sleepypercy
AO3: https://archiveofourown.org/series/266392

Also, I have another infidelity recommendation.
"The Last Time" by
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Here is the link for story on AO3; it's been orphaned like SloeDjinn's other works.

https://archiveofourown.org/works/16146380

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Hi...I'm shocked to see that there were no responses. The fic you're referencing sounds vaguely familiar, but I'm not sure about it. I do have a rec, though.

Outtakes by cherie_morte/
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Well Fed and a couple other works by sloedjinn have been orphaned.

https://archiveofourown.org/works/16146221

This should be it.

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No problem. This story is one of my absolute favorites.

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https://alwayseven.livejournal.com/383658.html
Also at AO3 https://archiveofourown.org/works/148253

Summary: Chad and Jared have been best friends, attached at the hip, for ten years. Everything changes the night of their junior prom when they make a stupid, drunken mistake. They leave a few days later to spend the summer at Jared's grandparents' ( Read more... )