Can i ask what type of yandere would be marco?π
Marco as a yandere is almost unfair. He's got those emotions on lock before you meet him. He's calm, collected, kind, in control, and there's no hope of escape.
Sure he'll woo you properly, little gifts, sincere compliments, his actions and words tailored to your every need. It doesn't matter what kind of darling you are, you're going to walk into his room under your own power unless something comes along and shatters all his careful moves and plans.
Even the most careful planner cannot control everything, but on the Moby? Around his brothers and his crew? Even in a modern AU with all the power and prestige of his family - and he's no slouch even on his own, certainly. There's no need for him to be anything but relaxed, he'll ingratiate himself easily.
If you are a runner darling or defiant, by the time you come to understand that you should be getting away from him, you're already locked up tight. Especially if he feels like you're the type to make a break for it at the slightest concern.
And you can scream and rage and fight against him after the fact, he won't mind. He'll give you reason to sing sweeter songs for him regardless. He won't need to do anything as extreme as breaking your limbs, but he could, with ease, and he could mend them just as well. It's not a game you want to play, certainly, but he will indulge you, if you so desire.
He won't leave room for doubt about how inevitable things are, so just give in. It's alright pretty bird, he'll give you such pleasures, treasures and experiences, come sit in his lap, and show him that you accept and appreciate his love. That's all.
Some Yandere to Soothe the Ache