It was Bethany

I scrambled for my towel as quickly as I could, but the damage had already been done. Bethany was blushing furiously and muttered an apology before closing the door behind her.

I quickly dressed and left the room. She was walking down the hall. "Bethany, wait!"

She turned and looked at me. "I'm sorry about that, but I don't understand..."

"How you got the key to my room? I thought the clerk handed my wife and me the only two keys to our room."