Aizawa decides that the best way to help you heal from your trauma and to become closer to him and feel safer is to participate in some platonic BDSM; puppy play to be precise. So you can learn to trust him and not worry, let him make all the decisions and get praise and rewards when you obey.

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As always, art work isn't mine and I don't own Aizawa or MHA.

If this photo is someone's personal work, please let me know. As far as I know it's just a screenshot from the anime but I've never finished the show despite reading spoilers. I just found the photo online.