Munk differs a lot according to who he's with, because the dynamics are so different and he adapts himself to the needs of that particular cat (or cats—Jellicles do polyamory, of course).

With Jerrie and Teazer, though they aren't children (obviously, if we're talking about sex), they still feel like cats he's responsible for and has to care for (and manage!). So there'd be a mix of tenderness and bossyness, a 'let me take charge of this / take care of you' attitude: soft growls and pantings and a lot of purring and praise. He'd put himself in charge of finding her limits and minding them for her.

Similarly with the other young cats—though some, like Pounce, I can see getting off more on being dominated or the size difference, so that would probably drag out a deeper register in Munk's voice, more rumbles from the chest and low groans and heavy possessing breathing close against the skin. Endearments too: baby boy, kitten, sweetheart, my boy, and so on.

With cats like Bomba or Cassandra (or, to a certain extent, Alonzo) he trusts them more to set their own limits and to look after themselves and him, so he relaxes a bit more. He's still not particularly loud but the sounds he makes are higher up in his chest and throat and mouth, pleased hums and chuckles and soft long moans.

Demeter would be similar but I think he'd be more tender and gentle with her. As for Mistoffelees, depending on which version of him you've got in your head, the dynamic could be just about any of the above!

With Tugger it's either a growly half-serious struggle for dominance, or something relaxed and playful, with laughter and eye-rolls and huffs of exasperation and fondness, and snatches of converstaion because Tugger is a talker, easing gradually into deep satisfied groans toward the end (and grumbles if Tugger's being particularly obnoxious or teasing).