Draco had tears in his eyes. "I-I didn't mean to...."
"I know and I really think that Harry knows it, too. But understand that Harry was trying to open up, and that's a good thing. So, do you want my advice?"
"Please... I don't want to hurt him," he whispered.
"When you see him... apologize... really apologize. Ask him if you could talk to him about it, again, and really answer him. Really think about your desires, fears and triggers and help Harry work through and overcome his. Talk to him. Communication is so important."
Draco nodded. "Thanks. I'm so lost sometimes about what to say and do, especially around Harry."
"That would be your fear talking, and if you didn't know, one of your biggest triggers."
"What?"
Carla leveled with him. "You... are... afraid... of... Harry...."
Draco's eyes widened. "I love Harry!"
"You're afraid of him, though. You shut down the second he challenges you or gets angry. Do you know how much your fear spiked when he snapped back at you about him being weak?"
Draco swallowed hard and lowered his head. "It's not just Harry. It's the anger. I know he won't hurt me...."
"But you still get scared, regardless. Does he know that anger is one of your triggers?"
"Probably," he muttered.
"Probably is not good enough. Try harder, okay? Please talk to him about these things... I mean carefully, too."
Draco nodded. "At lunch?"
"Yes... the hour time limit will give you both a breather to think about what you'd want to say later."
"You think it will be okay?" he whispered, needing reassurance.
"Draco, come on. Harry knows you very well. He didn't seem really mad about your denial and honestly seemed relieved that you understood him at the end, even a little."
"Do you think he'd be mad that I asked you?"
"Have you even told him about me?" Carla replied, giving him a knowing look.
Draco blushed. "He's so afraid of mind healing."
"Your current job. Of course, you didn't. You're so afraid that he'll react poorly that you don't even tell him what your field is going to be. That's not good, Draco."
"No one will let me be a mind healer, anyway. I just spent nearly six years in Azkaban for attempted murder and conspiracy to commit murder," he muttered, his eyes watering.
"I've been told that your record was expunged, Draco."
"I didn't take my NEWTs." 
"Neither did most of your class, and they were accepted with just your OWLs. Harry was an Auror and then went into Healer field without even attending his NEWT year. Don't be so pessimistic."
"Pessimistic? It's still a fact what I did and what happened to me, and you still haven't convinced me that I could handle helping real people and situations. I haven't managed to go anywhere without Harry or Blaise escorting me."
"You're here, talking to me... alone."
"I've seen inside your mind. I trust you," he mumbled, looking at the floor.
"Thank you for that, Draco. You don't think that it will be like that for any patient you have? Do you understand the power you have? No mental block would hold you back...."