Eric has no desire to take Dawn away from her sister. He's perfectly happy with the situation as it is, but he wouldn't object to Dawn moving in either.

"We'll start with a drawer and a toothbrush," he tells her. "Bring over whatever you like. I'll make certain that there's room in the closet."

It certainly makes things more convenient.

It will, and quickly. Once she's had enough, he pulls his wrist away. The doorbell rings and Eric gets up to get it. He returns with an armful of food, which he puts on the coffee table next to the couch Dawn is sitting on.