Fics like non-negligible collision

Mac meets a nice guy who's on a business trip and ends up with a boyfriend for the summer.

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6. Underneath by andchaos (It's Always Sunny in Philadelphia)
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8. sell me on that thing you do by kafkian (It's Always Sunny in Philadelphia)
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11. Sibling Rivalry by orphan_account (It's Always Sunny in Philadelphia)
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13. bluer than a twin flame bruise by angrymac (It's Always Sunny in Philadelphia)
14. each the other's world entire by quixoti (It's Always Sunny in Philadelphia)
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16. like real people do by notreallywriting (It's Always Sunny in Philadelphia)
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