1.

"I want Malfoy to be on house arrest for at least a year."

"Okay...and?"

"And I would prefer he stay with someone I trust; someone who is invested in his well-being. Malfoy Manor has been seized so he is essentially homeless for the time being. He has nowhere to go, Hermione, and I wanted to ask if he could stay with you."

***

When two natural enemies are in forced proximity, only chaos can ensue.