
it's emotional abuse. MD knows chanwoo won't say no. if you pay attention, it's implied that chanwoo is a push over and doesn't know his own limitations. MD is taking his personal feelings out on chanwoo.
after chanwoo rejected him, MD purposely tried to hurt chanwoo to make him say the safeword. forcing your partner to say the safeword is NOT okay. in what situation do you want to overwhelm your partner so much that you want them to have to signal you to stop the scene?
it's manipulative for MD to make chanwoo choose between being abandoned or "competing" to be his sub, when MD himself Wants chanwoo. chanwoo doesn't want to be alone, and yes, that's not the best trait he has but that doesn't give MD the right to use that to his advantage.
that's how this is abusive.
Yas MD my boi take your revenge honey