Bundle
Grasp
Why would you put your fingers on a bed? To bundle up the sheets — maybe because you need to do laundry or something. Grasp that bundle of sheets tightly, and be careful not to let it unfurl as you carry it on over to the washing machine.
は, わ
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As you bundle up your sheets and grasp them tightly, you triumphantly exclaim, "Hah (は)!" to all your imaginary naysayers. In your mind, everyone doubted that you could actually bundle up your own sheets and launder them yourself.