Some prompt ideas -

Role A = Authority Figure (Boss, Teacher, Royalty, Trainer, Dom, etc.)
Role B = "Underling"
Manipulative Romance


Role A = "Hunter"
Role B = "Prey"
(have several ideas how this could go)


Role A = "Worker"
Role B = A Regular
Blossoming Romance ~


Role A = Childhood "relation" (friend, bully, cousin, sibling, step-sibling, etc.)
Role B = Seeks to reconnect after years
Long unrequited love confession, Romance




For those seeking darker themes, you need only to let me know - I can think of many ways each of these can go to some very dark places. Happy fluffy stuff is not really my thing -