So you want a BAD ENDING? Where they are ambushed and killed during their scat party? I had that in mind before the incest-scat party idea.

The Bad Ending to the Devil may Poop scat party. In this alternate and non-canon ending, two murderous lolis Sarah and Ellie from The Last of Us ambush them. Morrigan suffers a humiliating defeat. The all-powerful witch gets killed by a little loli. She than creates a humiliating display of her by putting her head on her vagina and licking her feet. Sarah forces Keiran to look at this dirty display of his mother and cum to it before she ends him. The two lolis leave Nick for last, making him cum to the sights of his dead friends he just fucked.