When Yui allowed her ears to be touched and licked by Mihina after she subdued her to reward her by licking her ears that way
Here I know that Yui was controlled and became submissive when Aoi Rena licked and play with her ears and Yui didn't do anything except become sub for here.
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![Licking her delicious belly button [BBAN-341]](https://img.reddit.tube/thumbnails/f4cdaa88325e2e31d9ea60cb7baf753b3a4b0929.jpg)