I'm not quite sure but I think Paimon's face and crown/halo is a parody to that one show Smiley Friends right?
“Look Paimon, I know it’s our job to help this guy and everything, but I think this guy’s a lost cause. Why don’t we just cut our losses and get out of here.”
I mean , Lumine could aready score with him but she likes the strapon more?
She doesn't just want him to fuck her, but to want her unconditionally. To fall head-over-heels with her. She wants to break him to the point where he can think nothing else but her.