Ok, if somebody wants to take this idea and uses it for a comic, you are completely welcome to do it.
Let me say something: I hate hugging babbes, the idea of two stupid foals hugging each other like all love and peace (knowing that, when they grow up probably will be smarties or one of them will kill the other), make me angry for some reason (sounds weird but Im not able to tolerate any drawn of huggin babbes).
So, my idea is simple: if they like to be together, why don’t paste them forever? Is easy, use superglue or sewing them. Let them be able to move a little bit.
Them, using a bottle of water fill with mashed food, feed them BUT fill the bottle with only the equivalent to feed a regular foal, not for two.
At the begging, probably they will be happy because they are pasted with their beloved sibling but, when they noticed there is only food for one of them, they will start to fight.
If they share the food, they are not going to be satisfied. So they egoism will rise and the first to eat, will eat all. The second will start to cry and that will annoyed the first one. The hunger will start to kill the second one and, there is two option: Cannibalism or death.
Imagining the survivor one having to live with the rotten body of the dead sibling. The disgusting smell doesn’t let it eat. All the flies and maggots eating the dead body and all the nightmares, also the infected wounds when the survivor tries to remove the rotten corpse.
And finally, Wan Die loop, so you kill it or leave it in its living hell.