not that i think/want this to happen because this is its always sunny in philadelphia but if dennis and mac ever hooked up and/or if dennis was ever direct and reciprocal about his feelings mac would not want him anymore because he only craves validation from people unwilling to give it to him (ex: his parents, god, dennis). once someone in his life shows genuine interest in him he literally does not gaf (ex: his uncle donald). if they ever hooked up it would literally be a charlie and the waitress situation i can totally see dennis having an awakening and mac being like. I think i'm finally over you