I had a little OWO moment on someone's Discord discussing plush and someone there suggested encasing.

Nick the shaymin stumbled upon a large pile of plush. Pawing through it, he found out that its a large bright eyed Ninetales with an entry thats just large enough to squeeze into. Really loving its softness, he couldnt resist but to try it on. Its smooth soft fleece entry was welcoming as half his body enters. Suddenly, the suit plush felt tight and started pulling his arms in. Nick was frightened and tried to resist being pulled in. Slowly, his arms are consumed by a ton of plush that soon became his arms. His new paws were so puffy, he couldn't grab anything, he couldn't even stop the zipper that was gradually closing him in. With only his head exposed he couldnt move a muscle. The plush is so soft and puffy, it became stiff and impossible to move. Before him was the head of the suit gradually engulfing his head. Nick had submitted to the foxy woxy softness and grew more and more excited as the head closes and squeezes him tightly in the mass of plushy.