LET ME IIIIIIIN

It's like a summoning in miniature, and he most often gets summoned by devotees for [nonsexual] worship purposes, so he associates it with being warmly welcomed onto the mortal plane as an honored guest.

He likes the negotiation process itself, actually, because it's very much a ritual in the same manner of those needed to summon him into reality in the first place. Summoning rituals outline the parameters of his interactions with reality just like kink negotiation outlines the parameters of sex

Of course, outside of kink scenes he doesn't actively pursue mortal sexual partners. He waits for them to make the first move, because he knows he is so incomprehensibly powerful that even asking nicely could be coercive. No coercion until it's negotiated play with a safeword

--because if you're gonna suck him off he WILL have to rehinge your jaw for you. He is going to very literally rearrange your guts, but he will make sure to put them back where they were once you two are done. Mortals are very fragile after all!

his default minimum height in his preferred form is 8'6" with a cock to match, so anyone interested in climbing that mountain has gotta push beyond some limits to fuck him in the first place. Not that he's unwilling to offer a little assistance in the form of eldritch fleshcraft--

So, of course, it entwines with his kinks. "Serve Me, mortal. Use your body to please Me. Push yourself to your limits to prove your devotion to Me, and you shall be rewarded with My most arcane secrets." Stroking his ego gets him just as hard as stroking his cock

that cactus tailtongue is going all the way in. be thankful he can retract the thorns.

SIR.