I'm pretty sure that's Kallen in Theresa cosplay with Sakura. Her hair is braided like Kallen's, and Sakura's reaction could only be achieved by the presence of her lover, which is Kallen. So, Kallen is getting quite frisky with Sakura in secret, and it looks like Theresa is about to catch them in the act. Sexy and dangerous with those removed panties and chains.
I'm pretty sure that's Kallen in Theresa cosplay with Sakura. Her hair is braided like Kallen's, and Sakura's reaction could only be achieved by the presence of her lover, which is Kallen. So, Kallen is getting quite frisky with Sakura in secret, and it looks like Theresa is about to catch them in the act. Sexy and dangerous with those removed panties and chains.
Can confirmed its Kallen, and its not cosplay btw, Kallen wore them before, as indicated in her stigma set Kallen Hymn