Birds of a Feather (Flock Together)

Set around S4E11 of 'Gotham'

Oswald becomes Jerome's... whatever while sat in Arkham, waiting to plan his escape so he can safely get at Sofia and save Martin. He comes to terms with the arrangement quicker than expected. It's not awful, and Jerome's influence in the asylum helps make his stay more tolerable than it was the first time. It's not a huge price to pay.

He's working hard to move past Edward and he's pretty proud of himself for it.

But his eyes catch the shine of those idiotic glasses that frame his nose so well, and Oswald almost falls out of Jerome's lap when he realizes that Edward has been arrested and is here at Arkham with him... again. Because the last time they were locked up together had turned out so well.