Remove her bra first

You spring into action, though to her eyes you're barely conceivable as a blur.

You cross the distance at the speed of light to stand beside her. She's still looking in the direction where you were sitting, as you continue to move at unimaginable speed, and your perception of time is sped up at the same time, allowing you to savour every moment and take your time, as it were.

Your nimble fingers set to work, undoing the necessary buckles to loosen up her chestplate, so that you can slip up the gambeson shirt and get to her bra. She's wearing a black one, of lacey silk, and being strapless makes it incredibly easy for you to remove. You pocket the bra, and take the oppertunity to cop a feel, cupping both her breasts from behind and honking. Grinning to yourself, you put the gambeson and plate back in order, move back to your bench, and allow time to slip back into its normal pace.

"Before we start, is this yours?" You say with a coy grin, as you pull the knight's bra from your pocket and hold it up for her to see.

She does a double-take, and upon realizing it looks like her bra her arms involuntarily shoot in the direction of her torso, as if she's trying to cover herself even though still fully clothed. She explores beneath her shirt with one hand, and you can see in her eyes the exact moment she realizes her bra is indeed missing. Her pupils widen in sudden shock, and her face flushes red. "How did you get that?!" She yells at you in anger.

"Trade secrets", you reply with a smile. You aren't completely lying.

With an angry shout, she raises her blade and charges you.