Discipline
Hufflepuff's weren't known for cold, exacting discipline. Especially when they worked. They were better known for how messy they looked.
They were always covered in something or the other - paint, glitter, soil, paper, whatever-it-was-that-they-were-busy-with - and he has to admit that it was a cute sight on you.
You had grass stains and soil on your overalls as your hair threatened loose off your precious updo.
He wants to hold you tight and crush his mouth to yours. Kiss you breathless.
He sighs internally.
"Hey, Teddy" you say with a smile that was sunshine incarnate.
"Need help?"
"Would you? Thank you!"
He's got a class with his house next and he can already hear the contemptuous scoffs some would throw his way but he doesn't care.
A scoff or two couldn't compare to gardening with you.