Aw man, that really sucks! I feel your pain. Sub and dom stuff (That isn't abusive.) is rare in general, the only comic I know of that even mentions it is Sunstone by Stjepan Šejić, and I can't say whether it depicts that kind of relationship well since I haven't had the chance to read it yet.
Also heeeey, one of my MCs may be the same? It's not depicted in my main comic, and he switches positions occasionally but is generally a submissive top or 'service top', which some people consider the same as a service dom? The fictional world needs more service tops/doms.