My Recommendations

Homestuck

Dirk summons a demon for the exclusive purpose of 'cathartic boning.' He gets what he wants. 124302 words. Complete.

Hot, weird, creepy, fun DirkJake AU. Told in CYOA snippets and sometimes you have to turn your head/device. Does not work on mobile.

Karkat visits his boyfriend's ancient family mansion, over Christmas. Of course, Gamzee's expected to prepare for another of his family's rituals, too. 12513 words. Complete.

Karkat/Gamzee humanstuck. Very cute, creepy, and a little chilling. There's a lot going on in the Makara household that Karkat has to learn.

The Fisher Prince by roachpatrol, urbanAnchorite (t_ZM)

In which Eridan Ampora, seven-sweeps seadwelling ne'er-do-well, goes to market for his moirail, gets caught up in a political intrigue, is sent on an errand by his employer who is not coincidentally his kismesis, partners up with his kismesis' moirail and blunders into exactly as many problems as a fishtroll would expect. Includes two major fight scenes, religious blasphemy, zombies, some inappropriately passionate kisses and an inordinate amount of blueblood thugs. 29702 words. Complete.

Hemoswap Eridan/Feferi and Eridan/Sollux themed fic. Lots of good worldbuilding regarding quadrants that I have included into my headcanons. Part one of three.

Your name is ROSE STRIDER and you are a hole. You are a weapon. You are deeply, deathly sick and no amount of medication will ever, ever fucking cure you. 32932 words. Complete.

Gutwrenching kidswap Rose/Bro. Nothing romantic about it here - and incredible characterization. What if Rose was under Bro's ~~abuse~~ care instead of Dave? Would she make it out as well as he did?

Kankri's early experiences with the Beforan "culling culture" leave him a changed troll. 2449 words. Complete.

Kankri grows up on Beforus and experiences what culling is like. He makes his first online friends and discovers theory as well.

Tadpoles by snickfic

Yes, Sid had told Zhenya that he was an inhuman fish creature. Zhenya had mostly recovered. 8426 words. Complete.

A classic in the SidGeno xeno world. If you get it, you get it. And if you don't, you don't. I love this fic.

Thunderdome by siegeofangels

Shark biology SidGeno mpreg, what's not to love? I have used this fic to introduce normie friends to hockey RPF. Chef's kiss.

Eyes Filled With Stars by Cute Negativity Cloud (Ofelia)

[Did someone order a torture porn fic with a side dish of dieselpunk aesthetic and a sprinkle of Lovecraft lite? No? Well, tough luck.] 69085 words. All For The Game. Abandoned.

Andrew Minyard/Neil Josten and (noncon) Riko Moriyama/Neil Josten. Really heartbreaking, perfect omegaverse, angst, steampunk, what more could you want if you want your heart ripped out?

Star Trek: PBS by hellotailor

On the new PBS reality show "Star Trek," eleven highly trained contestants will team up for a simulated space voyage, completing challenges that test their mettle as explorers. 23425 words. Star Trek: TOS. Abandoned.

Really interesting K/S AU idea told via multimedia project. I remember looking forward to every update, and I hold out hope that the author will come back eventually! Just plain good fun.

Spaceship Greg by Illuminescence

After decades of indentured servitude on Al Murray’s private moon, Alex has made a break for it – scrambling through a junkyard in a desperate bid for freedom. He’s terrified, bleeding, and fears a laser blast in his back at any moment, but he would never in a million years expect to literally stumble upon a half-junked spaceship from the war in need of a name, a purpose, and most of all, a friend. 77070 words. Taskmaster RPF. Complete.

Fun hot heartbreaking AU where Greg is a literal spaceship from a long ago war. Alex characterization as a cute woobie. Good banter. Easily read without knowledge of the characters. Basically origfic with our boy's face and personality, in the best way.