Great idea, but should last longer. Even just going at half the speed would be fine, doesn't necessarily need more frames.
Edit: Okay, I futzed with it a bit. Not sure what dynasty's policy on links is... but here. https://i.imgur.com/qpjbVzp.gif
Tried to give you a little time to view each image while still making the motion-y bits flow okay.
i feel like Togou is always the dominate one. Shes so straight laced and strict by the books so it wouldnt surprise me if Yuuna would mess up and Togou would yell at her like a strict parent haha but i think its cute :P hey spanking is cute aslong as it isnt over the top