To add to that, I guess I like this kink with Germany because in a way, he's giving so much power over himself to another person, and trusts them not to abuse said power. He'd be very humiliated in a DNW way if his partner ever legitimately mocked him for it, or shared his kink with others unless he consents to that.

Germany's always in control of himself and always tries to control the situation, from the general picture to the littlest details, so to have someone like that give up any and all control he has, leaving him emotionally powerless in someone else's hands, and for them to do with him as they please, and for Germany to know and feel that is one of my favorite kinks.