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Mac and Dennis are used to pushing each other to the limit and beyond, but when Mac pushes a little too far, their relationship ends up shifting in a way neither of them could possibly have anticipated. Not in a bad way necessarily, though the long term consequences still remain to be seen.
In which Mac desperately clings to control he may never have truly had, Dennis wears the collar of a dog long dead and buried, and they both do their best to keep something together that's been broken from the very start. Dennis gets called a good girl a lot.
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Crooked Halo by Haunted_Obsidian for catboychrundle
Fandoms: It's Always Sunny in Philadelphia
21 Aug 2026
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Prompt - heeyy~~ ok so what do you think about mac and dennis taking molly together, but while dennis is high and horny as fuck, mac gets that effect where the mdma just treats his adhd. so while dennis is hornier than ever, acting like a complete slut, totally losing the mask he hides behind, mac gets to focus on finding new way of torturing the man and making him cry. plus he can remember everything the next day 👀
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our love's the only thing that could matter by oopshidaisy
Fandoms: It's Always Sunny in Philadelphia
24 Apr 2021
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From a distance, Mac smelled like an alpha.
(Or: Dennis has never gotten the appeal of alphas. He tries something else.)
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an act of worship
- Language:
- English
- Words:
- 5,526
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 8
- Kudos:
- 134
- Bookmarks:
- 21
- Hits:
- 2,018
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Mac And Dennis Get Ambitious by bluemonday1988
Fandoms: It's Always Sunny in Philadelphia
16 Nov 2023
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Dennis isn’t sure how exactly he got to this point.
He’s even less sure that it’s a good idea, that he isn't making one of the worst mistakes of his entire life, because he very well could be. He’s spent years committed to the notion that this sort of situation would never happen, could never tear apart his fragile sense of equilibrium beyond hope of repair. And now he’s gone and thrown all that hard work straight out the window, and he can’t even be sure that he’s mad about it.
The only thing he's certain of is that he doesn’t want it to stop.
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Mac And Dennis Fuck Nasty
*iasip title music*Series
- Part 2 of the season 16 macdennis dissertation
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A simple costume fitting turns into much more.
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Two halves always equal a whole, don't they? Maybe sometimes, even more so than others.
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I Am Small and Needy (Breathe Me) by Haunted_Obsidian
Fandoms: It's Always Sunny in Philadelphia
09 Jun 2025
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Prompt - macden clingy Dennis !!
- Language:
- English
- Words:
- 3,298
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 14
- Kudos:
- 106
- Bookmarks:
- 11
- Hits:
- 1,052
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something indefinable (between you and me) by noeta
Fandoms: It's Always Sunny in Philadelphia
23 May 2026
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Mac’s breath stops on an inhale. It’s hard to make it start again, but he has to, he’s got to, because holy shit, holy shit.
“You just said we’re a couple,” Mac breathes out, absolutely awestruck.
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Holding My Breath ('Til I'm Blue in the Face) by Haunted_Obsidian
Fandoms: It's Always Sunny in Philadelphia
04 Feb 2026
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Late one night, Charlie and Dee make a discovery. Shocking? Not so much...
- Language:
- English
- Words:
- 1,503
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 18
- Kudos:
- 63
- Bookmarks:
- 5
- Hits:
- 567
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Dennis and Mac take a late night drive to get away from the suburbs.
- Language:
- English
- Words:
- 2,016
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 5
- Kudos:
- 239
- Bookmarks:
- 22
- Hits:
- 2,672
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Mac wants to reach over there and slap Dennis so hard he forgets himself — forgets his empty apologies, forgets everything but Mac.
But Mac knows once this gets going, it'll be impossible to stop. Better to wait for the safety of the apartment, their own little world to destroy as they please.
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a kiss with a fist is better than none by rillrill
Fandoms: It's Always Sunny in Philadelphia
14 Dec 2014
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Dennis is a forest fire. Mac is kindling at the ready.
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a loaded god complex (cock it and pull it) by rillrill
Fandoms: It's Always Sunny in Philadelphia
17 Nov 2014
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He likes that he doesn’t have to think about this, that it just is what it is and will continue to be what it is every day for the foreseeable future. The sun will rise in the east and set in the west and Mac will be there, raw and needy and eager to please and easy to shape, pliable as modeling clay and ready to mold himself into whatever Dennis needs him to be that day.
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you sound insane (but god, I love that pretty face) by mayinthebackyard
Fandoms: It's Always Sunny in Philadelphia
24 Apr 2022
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Dennis decides he's getting a face-lift, and he may or may not be desperate for Mac to object.
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Prompt - Pretty please do something based in later s17 (set around prime time or golden bachelor) about the behind the scenes in macdennis apartment… like what was REALLY happening there
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“‘Your mother is dead!’
Dennis can still hear Frank’s ecstatic announcement in his head.
‘Botched neck lift!’
Dennis feels nothing so far.”
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Dennis Tries Really Hard to Let Mac Use Him by Infinatesky
Fandoms: It's Always Sunny in Philadelphia
26 Jul 2023
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Dennis starts crying while he and Mac are making out.
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Today he needs Mac to kiss him, because he needs to show Mac that he’s still worth having around despite everything wrong with him. He needs to be useful to Mac. He needs Mac to use him.Dennis had found a new wrinkle in the mirror that morning, a deepening crease on his forehead. And his pants had been a little tighter to zip up. He’s a fucking mess. He needs to prove that he can be good for something.
Series
- Part 1 of Pretty Dennis Reynolds (One Shots)
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Let's Hear It For the Boy by Haunted_Obsidian
Fandoms: It's Always Sunny in Philadelphia
03 Sep 2025
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Prompt - mac has tacked on some mass (aka actual muscle lol) recently and dennis is desperate for mac to hold him up & fuck him against the wall, but his bratty bpd ass doesn't want to come right out and say it...he tries to get mac to "come up with the idea himself"
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"He….he could bite off Mac’s dick if he wanted to! If this was twenty years ago, there’s no way they’d be doing this. Not the sex, because let’s be real, they had drunkenly hooked up their fair share of times over the past few decades, but the trust. That Mac could just fall asleep in such a vulnerable position was getting off Dennis in ways he couldn’t possibly describe."
Or, the cockwarming fic.
For the November 2025 Year of the OTP prompts: "are you sure?", cockwarming, touch-starved
Series
- Language:
- English
- Words:
- 3,463
- Chapters:
- 1/1
- Collections:
- 1
- Comments:
- 16
- Kudos:
- 91
- Bookmarks:
- 11
- Hits:
- 1,225
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