The wolf was not freaking out in the slightest. The wolf wasn't even in the equation. The entire problem was Ariel's brain melting out of his ears. He was completely losing himself and that, in turn, meant control over the literal shape of his body - which was lucky for the both of them because there was no way in Hell this was stopping any time soon on either side.
And the distraction? It helped and it didn't. If anything, he froze in this between place with fur on his arms, his thighs, his back. It was rough on the surface but softer deep down. Amadeus likely wouldn't care. With his hands pinned, he was limited to what damage he could actually manage, thick claws sinking deep into the mattress as his climax grew... And eventually exploded outward with a strangled sound.