#And only because of something extremely trivial like idk man Jean thanking Eren for something like

[twpsyn-who]

Soulmate AU in which when you touch your soulmate you swap bodies. It needs to be skin on skin contact and is instant. The only way to get back in the previous body is to touch again, otherwise you're stuck like that.

No matter the body all psychological and physical damage stays with you. That means if you get hurt then swap bodies, you will still feel it despite no longer having the wounds. This is only the case of existing wounds prior to swapping ; if new wounds happen to the hurt body after the swap you won't feel them, but the person in the body when it happens will. A very complicated way of saying that you can't get away from pain by swapping bodies with your soulmate as it will follow you.

There's no known consequences to not changing bodies back once swapped, though some might get sick for a few days after swapping back if they waited a long period of time to change back (say over a month, even longer depending on individual)

Now this but, you know... JeanMarco. And of course they find out during their time in the 104th Training Corps, because there's no way their skin didn't touch at least once in +3 years of training and being as close as they are. It isn't until break when they're able to visit home that they learn what it truly means ; up until that point they used it to swap chores (is the only reason why Jean didn't try to kill Eren during their shared chores- because it was actually Marco all along). At that point they knew each other perfectly.

Of course the whole situation was a little bit awkward for both of them when returning. They probably would end up avoiding each other for a bit because teenager boys and stuff, all until someone finally got the guts to mention the tension and ask them what's wrong- which forces them to talk and stuff. Doesn't matter, this is not what I want to talk about.

But the beautiful battle of Trost and what if, hypothetical speaking of course, they touch skin after Jean gets another ODM? And they're so used with each other by now, they don't even notice until the mission is nearly done anyway. And I don't know man, the idea of Jean dying while in Marco's body? Marco (in Jean's body) saying "I need to find Marco" once the mission is a success and research for his soulmate, just for him to not find him?? Not find him until 3 days later when some of them are assigned cleaning duty in Trost and he finds his own fucking body bitten in half???

The realization that it should've been Marco who died that day, but didn't because he was in Jean's body. The realization that not only his soulmate is dead, but he's stuck living his life. He's stuck living the life Jean can't because he died in Marco's place.

SEEING YOUR DEAD SOULMATE EVERYDAY WHEN YOU LOOK IN THE MIRROR. Poor Marco would most likely avoy any reflective surface for a very long time, unable to see Jean's face looking at him.

The guilt of lying to everyone, because how does one even begin to explain what's going on? Him lying to Jean's mother to protect her from the harsh truth of the reality- that her son actually died and the one in front of her was a fake.

And the sad truth is that no one would notice because they've been doing it for months already. They knew how to act like each other to perfection. Even if Marco slipped at some point no one would question it because they got many traits from each other already.