Sorry. Move it back to a flat surface that doesn't obstruct the vents in any way. That cushion likely had fibers come loose and if the overheating continues you'll want to get the yearly laptop cleaning done next week rather than when your next scheduled maintenance.
My laptop is overheating and I'm experiencing a sickly heat from it? When I hold it on my laptop cushion for any length of time i get a burning sensation across my stomach. I wondered if it was because it was wireless technology and it was giving off bad waves of some sort?