Busy_Doin_Nothin requested this. I'm still not exactly sure what a yandere does or is (I know they're possessive and often aggressive, and it's an anime term?) If any of this is wrong, just let me know :)

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Sherlock-
He won't let you out of his sight. Period. And forget about talking to other men.

Mycroft-
When he's apart from you, he becomes increasingly agitated, although he's very good at hiding it. As soon as you're in his sights, however, he's very, very possessive. If another man tries to chat you up, well, let's just say that man won't be having a jolly old time

Moriarty-
He knows your exact location at all times. When he's not with you, he has people watching you. If a man so much as looks at you, well, they just signed their death warrant.

John-
He's very possessive, but more so aggressive. When you're not around, John is easy to agitate. When he's with you, he doesn't want to let you go. When another man comes into the picture, it's definitely not good.

Greg-
He's possessive, but not very aggressive. When you're in the presence of another man, Greg becomes very, very clingy. He does anything he can to get the point across that you're his.