11 fics. My comments in italics.
The Writings of Ben Solo by BurnedStars777
Post-TLJ, crash landed on deserted planet while fighting. Rey might be trapped with Kylo Ren, but she unknowingly holds a piece from Ben Solo’s past.
Behind the Storm (Storm Series Part 1) by inthegrayworld
Post-TFA, taking shelter from snowstorm together, VERY Explicit. Neither Ben/Kylo or Rey is naive in anyway about sex in this fic. I highly recommend the first two in the Storm series (each can be read as a stand alone, but they do build on each other), HOWEVER, if you choose to proceed to the third in the series, make sure you read the tags CAREFULLY and are fully okay with everything that happens in the third installment of the Storm series.
Faltering Beacons by angharabbit
Post-TLJ, crash landed on early 20th Century Earth while fighting. Absolutely beautifully written and delightful to read.
A Life Between Times by kuresoto
Post-TLJ, sucked into a time warp. The only time travel I have read where instead of the characters trying to change the past, they focused on living in the present for a hopeful future.
Just Us by violethoure666
Post-TLJ, Throne room scene divergent. Ben/Kylo and Rey are imprisoned Together for the murder of Snoke.
Post-TLJ, sheltering together. An experienced Kylo/Ben teaches Rey how to stay warm (served with a side of feelings between the lines).
In Between Memories by slinden
Post-TLJ, isolated and they don’t know who they are, they know they are on an alien planet, but don’t know if they are prisoners or being protected by the unseen beings. The mystery element drives very interesting character studies about who they are intrinsically and how without their identities, memories, force abilities and external labels they piece together who they think they are.
In the Middle of the Ocean Blue (Storm Series Part II) by inthegrayworld
Post-TFA, Ben/Kylo and Rey each have a mission … if only they could remember what it is … and who they are. They conclude through a “feeling” that somehow they must know each other and should join together on their adventure … whatever it is. I love these canonverse amnesia trope fics that explore who these two believe they would be if the weight their identities carry was cast aside. (Heed my warnings about the third in this series as noted above in the Behind the Storm entry).
Made Them Do It (but they might have wanted to anyways) add on …
Post-TLJ, Stranded on planet that seems to harbor unseen entities, “something makes them do it”. As they come to the realization that there is something off with the way they are acting, long suppressed feelings begin to bubble to the top.
Post-TLJ, “Captured and forced to do it”. It was only a matter of time before someone realized two powerful users could make a super powerful one. As Ben/Kylo and Rey come to terms with their imprisoned predicament, a nicely written internal struggle for Ben/Kylo emerges.
Oblivion Series by orphan_account
Post-TFA, Ben/Kylo and Rey have had enough of their respective sides and go AWOL. Serendipitously they run into each other accidentally … and then keep on running (in)to each other not so accidentally. This is a beautifully written series, so beautifully written that I am recommending giving it a try even though it is not only incomplete, it’s orphaned. It appears to have been planned in five parts, but only the first two fics are complete and the third 5/6 completed. However, even in its incompletion, it explores abandonment issues to desperate longing with a well contrived subplot in what feels a very natural progression for these two. It also features a very apt characterization of Rey, even more so than she’s depicted on screen - I’m not sure how to convey it, but this portrayal of Rey makes “sense” to me. She’s scrappy and always in a survivalist mode, socially awkward and just as lonely in a room full of people, but never lonely with Kylo/Ben. At any rate, it won’t be often that I recommend an incomplete, orphaned series, but with two completed fics and an almost completed third fic, there is enough here to enjoy.