[Bruce breaking his no kill rule and it's Damian]

Damian was in an accident on a space mission and got hit with a lethal dose of radiation. All Bruce can try to do is make him comfortable but his body is falling apart at it's seams and all the medications Bruce tries to give him just fall out of his veins like they're sieves.

Bruce gets him the softest blankets and gives him tastes of whatever he requests (eating any substantial amount of food causes him to vomit it back up within minutes) but it's killing him so slowly. And Bruce knows it's because of how hard Damian is fighting it because Damian knows Bruce can't handle losing him but the kid needs a break and he fought so hard his entire life So Bruce takes Damian in his arms, cuddles him, tells him he's proud of him and loves him and that everything is gonna be okay, and then gently takes Damian's head in his hands and uses the one move he swore he would never use Snapping damians neck Ending His pain