Let me tell y’all about my Johawin AU. (/)°‿°) /)+゚*。:゚+
Everything is the same except Mephisto has to go back to Gehenna once in a while to recharge his demonic batteries and hence release the possession of his host body, which he leaves in his gross boyfriend’s care.
Previously, his host had to be kept alive by a bunch of machines as he couldn’t survive without Samael’s demonic healing powers. But after kicking the Illuminati’s butts the True Cross obtained the technology to fix this.
Thus, Johann Faust wakes up finding the demon who usually occupies his body and mind gone and himself stranded in a time that is not his own.
Luckily(?) for him there is this strange smelly guy, who has no sense for personal space and is uncomfortably friendly with him, that offers to help him out.
So Ruin shows Johann around and they get to know each other and do fun stuff together, which Ruin doesn’t get to do with Mephisto because the demon either doesn’t want to or is already bored of doing. And everything is fluffy and romantic and they are being massive nerds.
Later Johann gets anxious about his time running out and admits that he’s afraid of getting possessed again. And Ruin tells him, while he cannot do anything about it, he will be there next time Johann wakes up and they will do fun stuff together again.
Epilogue scene in which Mephisto gets upset about people having fun without him, Ruin saying that he doesn’t know half of it, and Mephisto demanding details.
*curls up in a ball and cries*