my grip must be flipping, 'cause his handshake keeps slipping
"Don't bury yourself in the part."
His annoyance is cataclysmically feigned, acting on acting, because inside his cvnty (an appropriate adjective, according to Sulu, even if slightly out of time) little ascot and jacket he's sweating bullets about the paradoxical implications of it all (Sulu again, Sulu again), and he knows Scotty should be twice as twitchy, for all he's an engineer and they're both the neurotic type.
But then his own lips twitch, amusement. He hasn't seen Scotty this happy since the Excelsior sabotage (scanning, scanning, no vessels' pursuit).
No act.
He loves his job. He loves his partner.