Calling him the wrong name prank

You and yuji have been together for a while now about 6 months. You two have gotten pretty comfortable with each other. Even sparing has become a smaller game to you two in your free time with loving play fighting

And right now, you two were play fighting, light hits, pillows and fists, and giggles getting pinning down and starting over again, but this time, as he had you pinned, you laughed out another mand name

[But little dose he know, on purpose just to see his reaction]