Y is for Yandere
Headcanons for Sherlock, Mycroft, and Moriarty
The prompt: Yandere
Genre: Disturbed, mature, horror
Rating: R (WARNING: unhealthy / dangerous relationships)
SHERLOCK MASTERLIST
Boy, these are some of the worst people you’d want as a yandere.
Sherlock Headcanons
He is all about “protecting” you.
Sherlock is intimately familiar with the depravity of human nature. He understands, better than anyone else - certainly better than you - how utterly savage, and awful human beings are.
He knows the statistical average of how many serial killers are currently at large in London. He knows the average of how many murderers, rapists, thieves, and so forth, currently operate in London. He knows these facts by heart, and it is with this knowledge that he acts.
You didn’t understand, he told you. You didn’t see the truth of human nature, the horror of it.
It was why he had to protect you. He had to be with you every time you left the flat. He had to make sure no one would try to take you, try to hurt you.
He knew humans, and you did not.
It was why you didn’t notice that cashier!
That cashier who stared at you too long must have been dangerous. Sherlock could tell immediately, and that was why he had to get you out of there. He had to get you back home, where it was safe, and then he had to make sure that the cashier would never, ever, hurt you.
And when he got home, and told you it was time to move far, far, away it would be best if you did not argue.
Arguing might mean that Sherlock would have to take drastic actions to keep you safe.
Like drugging you.
Tying you up.
Throwing you into a trunk, and taking you far, far away.
It would safest to go along with Sherlock to this “far, far away” home that he had prepared. A place so isolated the two of you could finally live in peace. There was no need for neighbors, or a town. Everything could be delivered - and Sherlock would always be the one to pick up the mail, or answer the door.
You had no need to see your family, or friends again. They could not be trusted.
You could work from home, or not at all and let Sherlock provide for the two of you.
You really only needed him, he said.
Sherlock only wanted to keep you safe, after all.
So surely, for him, you could let him?
“Stay here with me, stay safe with me.”
Mycroft Headcanons
He would be a “control” focused yandere.
It’s important to know that Mycroft knows best. He knows what you want and need better than you do!
He’ll commit all of your favorite things to memory, and surprise you with them.
But when things get sour - as all relationships do at some point - Mycroft isn’t afraid to make the necessary precautions to keep you safe, happy, and his.
Even if that would mean locking you away in some far off location, and only he would keep the key. For your happiness, he would tell you what to eat, when to eat, when to sleep, what to wear, what to read... everything in your life would be orchestrated by him.
Because Mycroft knows best.
Fighting back would be hard, and dangerous. This man has so many connections that it’s doubtful you would ever be free from him. Even if his brother chose to help you, it’s no guarantee.
If you do choose to still fight back and try to escape, you will be met with clinical fury.
He just wants you to understand that he’s only trying to help you. He needs you to accept his help, or he might start to lose his temper with you.
While it’s highly unlikely he’ll go so far as to kill you, he very well may do what he can to break your mind.
He knows best, so he knows how to take care of you... including a catatonic, traumatized version of you.
So accept his help. Play your part. Obey his every command, and he’ll treat you like a prized possession.
He loves you more than anyone else in the world, after all.
Only he could take such good care of you.
Only he could have you.
“My own little doll.”
Moriarty Headcanons
This guy is d a n g e r o u s
Murder-suicide is an honest ending for Yandere!Moriarty and you, so you have to be extremely careful with this guy.
He won’t let you leave. There is absolutely no option for you to leave him once he’s got you. He’ll invite you up to his home (and it will filled with special rooms in case you disobey him) and then you simply won’t be allowed to leave.
It’s not like he thinks he’s protecting you or anything (because he knows he’s the most dangerous man out there). But he will not tolerate the idea of someone else looking at you, let alone being with you. He wants you all to himself.
He’ll eliminate anyone who tries to search for you. Family, friends, coworkers, officers… it doesn’t matter. Within days you won’t exist to the outside world and anyone who would have remembered you would be dead and buried.
There won’t even be a single picture of you on the internet.
As long as you behave he’ll treat you like royalty. He’ll buy whatever you want as long as it’s not something he disapproves of.
He demands absolute obedience. Even one murmur of disobedience will be systematically punished. He won’t want to mar your precious skin, but he can be extremely cruel in other ways.
He’ll be very affectionate, though. He’ll wake you up with kisses and take you dancing around his penthouse. He’ll cuddle with you, hold you, and watch movies with you. He’ll go out of his way to make you smile (as long as you don’t ever fight him or try to leave.)
This guy is not above breaking you to get his way. If you resist too much he’ll b u r n you. He will ruin you to the point that you literally cannot live without him. And if by some miracle you retain a will to fight against him he’ll kill you and then himself.
If you’re able to have children he’ll probably want to rush a child on you, because that’ll be an easy way for him to control you.
No more than one, though, because he doesn’t want to share you too much.
“You belong to me, my sweet.”