mac and dennis being so codependent that they can't function without each other for one afternoon. dennis taking mac out every month and even telling him he's spent the last 29 days looking forward to it when he apparently hates going on dates with women.

mac fantasizing about dennis telling him he can’t live without him and that he loves him over and over when he died. mac dreaming about dennis kissing him and looking ecstatic when he wakes up and thinks it's happening for real.

dennis looking at mac almost in tears when he bought him a valentine's day present. mac openly flirting with dennis, touching him and trying to kissing him several times.