Harry found her sketching an array on the floor of an abandoned classroom.
The parchment peaking from his satchel answered 'how' before she thought to ask.
"...can you teach me Occlumency?" He ran a hand through his hair. "Snape's been trying but he's Snape. And you used to study it, right?"
"...I have natural shields, so I've only studied how to lower them."
"Right. So, can you?"
A sigh.
"...can you go a week without antagonizing Umbridge?"
"What?!"
"Occlumency is about a different kind of willpower. Mental control. Self-denial."
"..."
"No, Harry, I can't teach you."