Big mousepad.
Plan on this one taking up plenty of real estate on your desk, and I'd advise getting smaller breasts than the ones recommended here on this page if you want to actually use it as a mousepad.
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This Oppai Board is the base for the DIY Mousepad series from Tama Toys. To complete your Oppai Mousepad you need the Pururun Oppai Drop as well as a cover of your choice.
*Oppai (Breasts) and Covers are sold separately