"Oh! That's pretty keen." Her head had turned, following the hand wave. Then turned back around toward the other side. "I live right over there." She squinted one eye shut, fingers curling together so that only one was extended and pointing toward her half of the world. Which was just the building over.
"Come over whenever you like!" She invited over the other woman with a blanket sort of invitation. It was rare that Tonks didn't want guests, so didn't see anything wrong with doing that. Then the youthful woman smiled happily and hugged the book.
"I am! I've read it a bunch of times, but it's one of my favourites. My parents read it to me when I was a kid." She shrugged then.