Jabber is definitely aspec to me.
High libido, but plain old sex is kind of a nothingburger to him because he's not sensitive or particularly interested by default. More specifically, sex is the main course to most people, and spice is just the seasoning to make that better. But to him, power play and pain and kink stuff are the main course, and sex is just there to add another level to all that.
Hence why he gets hard at the idea of being locked up and getting his ass beat, but doesn't actually bring up sex acts when waxing poetic about it.
He also doesn't initiate sex, because most of the time people only want to do the sex part and the rest is half assed or insufficient, which makes propositioning them a waste of his time. And because it makes people ascribe a level of agency to his actions that he doesn't care for. He wants to be an object to use and abuse, not a participant! He wants to be able to give up and let go because there's nothing he can do, without actually having to give up.
(Being discarded afterwards is proof that he's as worthless as he knows he is. There's something sweet in getting confirmation that he's right, and that he'll never be anything more than a good fuck.)
(The first time someone sticks around after that and keeps coming back, and cares more about who he is than what he can do for them, he's angry. And after months, even years, he's devastated. Because if he's worth it now, why wasn't he worth it then?)
Secretly, he also doesn't like initiating because he's been pushed away and rejected so many times that the other person has to want it, want him, badly enough to push past his disinterest for him to want it in return. Yes, this also means there's some level of CNC going on most of the time.
Furthermore, I think he only experiences actual attraction to people who have shown they want to have power over him, which makes him some flavor of demisexual because it always takes some form of connection and interaction for that to become apparent.
In a relatively stable relationship (regardless of how stable it looks to everyone else) I think he would eventually want to see the full spread of reactions he can get from his partner(s), and be willing to initiate and be more assertive. But I also think that ultimately, being wanted and having the other person put in the work, without having to worry if he'll be too much work to satisfy, is what he prefers.
One final aspect that I've been sort of leading up to is that I think his flavor of asexuality as I see it, and the way it's linked to power play, is fairly intertwined with submission. But specifically submission as an act of power and defiance, because no one can take power from you if you're giving it to them, and you're still in control if you're a willing participant in your own destruction. And later as an act of trust, because he's trusting whoever he's giving his submission to to use it responsibly and make him feel safe and loved (while they tear chunks out of him and make him scream <3).
