How would you bully Darkness?
I'd stop whatever I was doing whenever she started saying the "You'll break muh body but never muh spirit" shit. If she wants lewd, she's going to have to learn to beg for it.
Slap a chastity belt on her and fuck Megumin in front of her. Taunt her about how much cuter Megumin is than her pathetic old divorced ass. Pull out of Megumin and finish on Lalatina's face, then make her suck Megumin's juices off your dick.
Maybe just make her Megumin's slave in general. She can beg Megumin to let her fuck you.
we aren't supposed to be impressed by this right?