Mari-chan, even though no one told her "hold it in," she tries to endure by asking herself "Should I hold it in?" But her body trembles violently, shaking and quivering nonstop. She tries to endure without thrashing around, but sweat starts to seep from her armpits and groin, impossible to hide anymore. Especially the area above her ribs seems sensitive; just a light touch makes her collapse immediately with "Hyahaha... ufufu..." She's trying to hold it in but completely failing, and that sight is cute. Mari-chan, trembling while trying to endure, is the best.