For me it's office romance and school romance (especially teacher to student). Heavy on offices romance, i can't understand how one can be attracted to someone that they work together, like aren't yalk tired of seeing each other face everyday!? Have you heard of "absent makes the heart grow fonder". Idk it's that and smth about the power dynamic aren't just it for me(and i live power imbalance in couple( ￣□￣||)
