It's such an odd kink but one I kinda heart nonetheless and MADE SO MUCH BETTER BECAUSE FAITHWOOD OF THE EPIC WORDSMITH WOODS WROTE THIS!
A SLIGHT MISCALCULATION by
faithwood summary
Arthur and Merlin track an evil, murderous creature back to its lair. Now if only Arthur would leave so Merlin can kill it.
NC17 | Canon | Merlin/plant, Merlin/Arthur(implied) | tentacle!kink | 2k
you should read it because 1 - it's faith and she's amazing in any/every fandom, 2 - TENTACLEPORN!! 3 - Merlin is SO merlin in this it could be an x-rated moment from the show!
"Furry," Merlin helps out. He spreads his hands. "Big." Makes a grimace and scratches air with his fingers in imitation of a clawed attack. "Growly."