"Muse" by remuslives23

http://www.fanfiction.net/s/4990087/1/Muse

You've got to appreciate a fic that includes the warning: "Sex. Oral, anal, rimming (very mild)."

This is some pretty straightforward erotica, although it's relatively well-written and believable. Remuslives does a fairly good job of using the sex in her stories as a means of character development. It's not exactly my cup of tea, but I can appreciate what she does, for the most part.

Speaking of the way she relates to canon in this AU story, I enjoyed the way she used James and Peter, and Remus's muggle parallel is very lovely. Sirius's plot, however, gets a bit lost in the shuffle and I sometimes found him lacking depth. But, like I said, this is SMUT, so, who really cares?

"A Cure For Nightmares" by picascribit

This fic is so sweet it gave me toothaches.

http://www.fanfiction.net/s/6361279/1/A_Cure_For_Nightmares

This is really just your run-of-the-mill RLSB Marauders era fic, with minor twists, but this fic is so straightforward, that I kind of respect it for that. It doesn't pretend to be anything other than what it is.

Edit: I've decided to clarify, for the sake of my reader, that this fic does deal with some touchy subject matters, and that some people find those kinds of subject matters pointless in fanfic. I typically very much agree with that assessment. However, because this fic is obviously trying to channel canon, I accept it in this case, and I don't think it's exploitative or in bad taste, but some may disagree. 

"'The Parallel Worlds' Series" by LouisaB

When I started this blog, I decided to only recommend one fic per author, and that was it. After just a couple of months, I'm already bending the rules, though in my defense, it's for an interconnected series.

http://www.fanfiction.net/s/3920327/1/Double_Trouble_COMPLETE


http://www.fanfiction.net/s/3959071/1/Triple_Trouble_COMPLETE


http://www.fanfiction.net/s/4072843/1/Trouble_with_a_Capital_T_COMPLETE

I left out one story there - "Catch a Quaffle," technically second in the series, though it has nothing to do with inter-dimensional Marauders as it does Remus/Sirius fluff. And I just don't care about that.

After accidentally opening a portal and finding a parallel universe, the marauders (and Lily!) get into all sorts of adventures and wacky hi-jinks. These fics are actually really well-written, enjoyable, and pretty damn brilliant. The different marauders running around at all times is sure to make you smile. I doubt these fics would be half as popular as they are if it weren't for the RLSB aspect, but I actually feel like that's the weakest part to the whole series.

"Loved By All" by Draug419

Wow. This is a weird, weird fanfic. And I mean that in a good way.

http://www.fanfiction.net/s/5092272/1/Loved_By_All

I can't even really properly tell you the plot without giving anything away. It's Remus/Sirius, but, once again, that is more of a backdrop to a really, really weird story. It's an AU, and Remus, Sirius and James (there's never any Peter in these things, is there?) attend another wizarding school, which is Hogwarts minus the charm and warmth. What you have here is a thriller that I couldn't stop reading almost despite myself. I kept wondering, What the FUCK is going to happen next?

Draug's writing isn't particularly good, but she does have a knack for interesting plots (she could almost release this as a whole new novel, given the way it strays from canon; I think she was influenced by The Chocolate War, but let me just say, it's not very much like that book, either), and she introduces some interesting concepts about magic (Imperius vs. Veritaserum for example) and that's where the rec comes from. A place of WTF.

"The Spy Game" by ttfn.tahtahfornow

This is a really lovely AU fanfic; it's subtle Remus/Sirius, but there's so much more to it than that. It's basically written as if the Marauders were muggles and neighbors and went to the same school.

http://www.fanfiction.net/s/3622968/1/The_Spy_Game

The plot to this fic isn't exactly amazing, but ttfn's writing style is really lovely. It's more a collection of viginettes than a fleshed out novel, but the pacing is done well - so well, in fact, that her lack of description seems to be almost the perfect way to write. She never hits you over the head with anything, and when the threads come together, you just have a nice a-ha moment in your head.

If I had any complaints it would be that it's a bit angsty, but not even I, who HATES angst (I really do), was turned off by this fic - the author just hands it all so delicately that scenarios that would be eye-rolling in any other fic just make you desperate for more in this one.

"The Dating Disasters of Sirius Black" by KaleyK

I was, for the longest time, anti-slash. It was in part because everyone and their dog were writing Remus/Sirius stuff and frankly, I never liked being part of the crowd, and also because it just didn't appeal to me. The chemistry between the pair had never seemed right. I was a big fan of Lupin/Tonks, though, and I was taunted quite a bit about that by "puppshippers" (this was before HBP came out and proved me right, of course).

That said, I loved reading Marauder-era fanfic and, basically, a lot of it was slash. This was the first Remus/Sirius fic that really clicked with me, though. It was the first time I thought, Well, all right, I can buy that, I suppose.

http://www.fictionalley.org/authors/kabeyk/TDDOSB.html

This fic has a great build-up, great character-development all around, nice writing in general. None of it happens too fast, and the Shakespeare parallels endlessly amuse me. This is the example of more-than-bearable slash, and, more than that, it's the example of why stubborn assholes (myself included at one point, I'll admit) shouldn't overlook the genre.