CNC = consensual non-consent, basically roleplaying being forced into sex.
The other CNC is a machine for creating physical stuff using computer. Like a laser cutter or a 3D printer. No idea what the actual meaning of the abbreviation is.
Ah! Struggle fucking! Didn’t get that. Always blown me away how many women are into that. But they have a fine line for playing.
Holding their wrists above their head? Pretty universal.
Tying their wrists above their head? Not unusual in the slightest.
Tied down, spread eagle? Yeah, gonna need some extra trust there.
Any of the above while they struggle and, “Oh no! Please stop! Not my little pussy!”, rare, but weirdly not as weird as one might think.