Marisa ate and ate until the box of bonito flakes was empty. Her body, more elastic than it appears, was stuffed until it "swell-swelled".
Marisa: "Yuu, body fweelsh a wittle heavy..."
Perhaps as a result of the sugar, Marisa ate much more than she needed. Entranced, she ate and ate her way into the box. Then, bulging and "swell-swelled", she settled in for a post-meal siesta.