"Yeah but it's still kinda weird. I mean everyone is dying, Pixie just lost her soul, Surge goes crazy and kisses Hellion effectively ruining the x-23 pairing, and oh let's throw in a nice plot twist!"
Thats what the writers wanted. They imagined that since everyone is dying all around they, the kids were just hooking up all over the place. Cus hey, they might not get the chance tomorrow, ya know? They could die at any moment. So they live every night like its their last.