Hi, already tried to find this fic at st_ficfinder, and I thought I'd try here as well--
I'm looking for a series where Sulu and Kirk were BFFs, based on their shared love of adrenaline and complete disregard for danger/consequences of their daredevil antics. Meanwhile, McCoy and Chekov were driving themselves crazy with worry. I remember that neither of the relationships were established, but that there was a ton of UST on both ends.
One incident I remember in particular is when Sulu and Kirk were on an alien planet, cliff-diving with alien gliding gear that (of course) malfunctioned, and that both McCoy and Chekov threw a fit when Sulu and Kirk landed, once again, in sickbay.
Any help would be appreciated, and thanks in advance!
Edit: Found by
pixelmayhem! Link in comments.