She looks like she wants to step on my face! I would let her in a heartbeat!

Ehh. I would push her away and rush my hand down Kana's camisole

I'd grasp Chiaki's lifted leg by the ankle with my left hand and slowly pull it in, pressing her sole against my clavicle.

Kana's blushing pretty heavily which means she knows her goods are showing. Despite that, she doesn't seem to be retreating so she'll probably be willing to let you cup her once you show how submissive you're being to Chiaki. If not, just buckle her elbow from the inside with your right leg and she'll come tumbling down chest-first onto your free hand.

Flawless Victory.

I'd grab her by her ankle and calf, while sweeping her support foot with my leg, making her topple on the other girl. Then I'd quickly jump on my feet and follow up with a kick to the head as she's trying to get back up.

I would just look. It's a drawing on a computer.

I would take it a step further and wonder how in the hell I was transported into a drawing on the computer.

Can't we just just give her a taste of her own medicine and aim for the pivot leg?

I'd prefer to give her a taste of my own medicine instead.

That's what I said.

Naaah!
I stand by what I said earlier! Still, nice to hear what everyone else would do!

My route leads to your desired situation, ph00l!

I would grab her ankle and shove it down kana's camisole.