Kink and thus sub/dom/switch isn’t inherently sexual, there are many situations where nothing sexual happens nor any of the feelings, thoughts nor bodily reactions are sexual.

I know this because I’m on the ace spectrum and have had these experiences, also I am sure a lot of allosexual people have too.

Unfortunately kink is often used as a way to spice up as a sex life instead of something entirely seperate from it, which is not wrong but it does give the impression that all kink is sexual when it is not.

If you want more information on this Evie Lupine (a kink participator and educator) on youtube has videos on this exact subject.