Red Crystals

After outbreak, Marius Streicher had to be quarantined away from everyone. Gustave was the only one who could check in on him. And yet, every time, Marius seemed to be getting worse. Marius slowly lost his vocabulary. Acting more like a feral animal. His partner, Dominic, would constantly scream and shout at doc. Demanding him to fix Marius.
But, he couldn't. Not yet.
Marius was moved to the med-bay, and now is being kept in a room. With bullet proof glass for walls, so Gustave can watch him. Dominic comes in every now and then, checking in on his husband.
But, one day, he sees the keys to the room Marius is being kept in. And takes them. After doing that, he decides to open the door leading to Marius.