The only fic I can think of that somewhat meets this description is Unknown
Pleasures (birdsofshore, 10.5k), in which Harry goes to the Room of
Requirement and is stunned to find that it’s provided him with lots of bdsm
toys and a curious Draco to play with. They do use bdsm as therapy, but they don’t work together to fix the room.
Other Fics with Room of
Requirements (ravenna_c_tan, 5k): A sixth year AU in
which a naked, blindfolded Harry keeps popping up when Draco goes to the
room to try to fix the Vanishing Cabinet.
Of Thwarted Plans (Faith Wood, 8.5k): Draco goes to the Room
of Requirement only to find Harry already inside, naked and wanking.
The Potter-Malfoy Problem (who_la_hoop, 29k): Whenever Draco goes
inside the Room of Requirement, Harry ends up getting summoned there (sometimes
sans clothing). And alas, the door keeps disappearing, forcing them
to entertain themselves.
In the Interest of Interhouse Cooperation (firethesound, 12k): Harry and Draco have to
co-run the new Dueling Club. They meet in the Room of Requirement, and the room
decides to play matchmaker by locking them together.
Kiss the Joy (Until the Sun Rise) (ICMezzo, 38k): Draco and Harry both find
their way to the Room of Requirement immediately after the final battle. Unable
to face the real world, they choose to stay in the room together.
To be Back Again in the Rest of the Room (lamerezouille, 16k): Draco and Harry are
trapped in the Room of Requirement with ghost Crabbe, only one bed, and no way out.
Sorry I couldn’t be
of more help! If anyone knows of a fic that has them fix the Come and Go Room
and then come in it, please let me know! I’ll be eternally grateful :)