What's so funny? Charles couldn't see the humor in the big scary creature being in his room. He'd tried to ignore it but it just got louder and eventually he just ran for Erik's room. Erik was bigger than the monster anyway, he could keep him safe.
Charles flops down on the pillow just under Erik's chin and neck, enjoying the petting. Lab rats don't get petted often, if ever. He pulls his tail around, holding to it to make himself into a ball. This is better here. It's warm.