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"Did you seriously believe you could spend the entire day outside in the tropics and not end up with a sunburn?"
"There are spells and potions...."
"Unfortunately with skin as fair as yours, you need to become accustomed to the sun a little at a time."
"At this point I'd just like a Time-Turner to take me back to this morning."
"How about I put some aloe on your back instead?"
"That would be acceptable."
"Did you really not realise you'd burn?"
"Just apply the salve, Harry."
"All right, Severus."