Mental/emotional equals navigate love in the face of inequality.

Possibilities include: slave/servant/underclass/prisoner/debt-bond; under-cover as unequals; reluctant master; hurt/guilt/comfort; kidnapped for a good cause; I bought him out of pity; I want my freedom but I don't; I'm doing this to save you but I can't tell you; . . . you get the idea.

May include voluntary submission or pleasure-and-pain, but these shouldn't be the main reason it's on the list. Contemporary realism is fine, if there's a believable premise.

PLEASE NO: standard BDSM; MC's who are long-term abused and emotionally destroyed; supernatural creatures or aliens with inherent superiority/inferiority; age gap that creates power dynamics.