Draco was still grinning rather idiotically. Here they were indeed.
"Well I can see why you'd get grumpy having to share," he said to the little boy, not realising the implications until he's spoken, deciding to keep his eyes on Teddy so that he didn't have to see any kind of reaction Harry may have had.
Teddy laughed, happy that the attention was back on him.
"But yes. It's a hobby you know? I enjoy it. Potions. It's only messing around at home, anyway. I'm usually just trying to see what flavours I can make or what colours I can make or if things bubble when they're added together-" Draco shrugged a little, careful not to dislodge the baby. "I'm a geek. I hide it well behind my rugged and manly exterior, I know, but beneath all of these dashing good looks I'm a complete nerd."