Don't get me wrong, being crushed by your feedee is great, but have you ever made a larder so weak that if they ever try to stand up without your help, they just *plop* back down to wherever their sitting like the blobs they are? Too heavy to get up without building momentum, watching their bellies swing and right when it grazes the floor, the slightest push to their wobbly chest sends them crashing backwards, cellulite dimpled ass spreading out beneath them? Pinning them to the bed with nothing but your grip around their swollen wrist and the weight of their belly pressing against the muscles in their back?
Pretty soon gravity will take over the job of keeping them pinned to one spot anyways.