CATWS/Covenant: Fun and (War) Games

( From a prompt: Bodyswap: Any Sebastian Stan character + Bucky Barnes, [character] wakes up in a room he doesn't recognize with a metal arm and superstrength. Chase Collins (The Covenant) is a textbook sociopath. He'd be an outstanding Winter Soldier.  )

From a prompt: http://comment-fic.livejournal.com/564726.html?thread=79400438#t79400438