He was thinking what? Hermione glanced up from her potions essay as Ron brought up something about a Saturday with no prelude whatsoever. Taking a moment to process what in Merlin's name he was talking about, she got a clue when he mentioned having everyone over. Plus that darn tattoo.
"That sounds alright, we haven't planned anything else for that weekend," she agreed, reluctantly putting her quill down. Hopefully no one else had anything planned either. There seemed to be a few birthdays at the moment.
Arching an eyebrow when Ron asked if she would come with him to pick a design, Hermione didn't mind that part. Sitting around while people were inked, however, she wasn't so sure about. "Shouldn't you choose your design beforehand?" she asked. "Gives you more time to think it over rather than just deciding when you get there."