Simply Put
The shortest Remus/Sirius ever, suggested by ThePerfectMess.
Remus and Sirius had been best friends since they were eleven. (And when we say "best friends" we really mean Hetero-Life Partners, because, despite the fact that they were secretly attracted to each other, they would never do anything to ruin their friendship.)
However one day, as the Marauders lay drunkenly lounging in Gryffindor Tower (for lounge drunkenly they did, almost daily), Remus looked about him carefully, making sure that James was indeed passed out and Peter was indeed amusing himself by playing with his toes, before saying seriously, "Sirius, mate, buddy, pal. I love you, man. In a purely platonic, hetero-life partner sort of way, you know? But seriously, I love you."
Sirius nodded. "Yeah, dude, stop making puns off my name."
"Got it."
"Besides, don't you get married to Tonks?"
"Yeah…. about that…. I love both of you."
And then they snuggled, in a very platonic hetero-life partner sort of way.
Yeah, so, college.
But I received a review from ThePerfectMess this afternoon and let me just say, you inspired me to write a Remus/Sirius chapter. (That and I needed an excuse to use the phrase "hetero-life partners" in a non-offensive setting.)