You know whose seems like they're be really into shibari ropes?
Barbatos.
Asks you to tie him up him up before RAD, so during the whole day he constantly feels them on him. It's a nice little reminder of your control over him. I am a "Barbatos loves feeling bruised a few days after a scene" truther, and this fits perfectly with that theory.
Barbatos also gets off on the knowledge that no one else knows what's underneath his clothing like you and he does.
Barbatos loves the knots that go over his crotch, so when he walks or stretches the rope tugs against his dick. It's not enough for him to actually get off on, but the feeling that you control his pleasure, even when you're not around, is extremely arousaling.
I also imagine that it's a bit difficult to plan ut times for scenes for the two of you, seeing as Barbatos is being tending to his young master, and you have school work and babysitting 7 demons. So having the constant reminder makes Barbatos feel like you're with him, even if physical you're not.
