yeah i'm pretty sure marking is a common kink anon, and for gyky i can definitely see them getting into it! dk loves seeing mg's bite marks on his skin cause it's a physical reminder of just how much mg wants him. mg on the other hand adores how marked dk's body is by him-- there's a feeling deeper than proprietary need running through his veins whenever he sees a glimmer of dk's skin, a burning hunger to mark him up so everyone knows he's taken, and that it's only mg who has the right to put those marks all over him.