You found him in the woods near an abandoned campground while you were burying the body there yourself. As fate would have it, the two killers met. it was an unexpected meeting was unexpected and not very pleasant considering Jason tried to attack you but was losing and finally gave up.

You didn't know why or why not, but for some reason you felt sorry for Jason when they agreed to take you to his house to give you water, or at least try to. So you decided to take him with you, but he resisted.

The house reminded him of his mother and his childhood, but with your persuasion and promises that you would take his things and his mom's things and live well, he agreed.

It's hard for two killers to live in the city, especially when Jason is literally a living corpse. So with a little bit of effort you cleaned him up, but you kept his mask on, because people just looked at him as a weirdo instead of a killer, and that was easier.

So you two started living together so that it was safer. But you noticed that even though Jason was an adult, he often behaved like a child, being stubborn, childish, curious, and so on.

Today you went to the store to buy groceries, but at some point you lost Jason and got scared. You walked around the store and found him. In the children's section?

Jason was standing by the toy rack looking at cars and stuffed animals. God, he's like an abandoned puppy.