Asuna was startled enough by the lewd display that it took several seconds for her to realize what Tannis had said.  "Oh... oh! Right, sorry!" she blurted out before rushing into the room and closing the door behind her.  Again, it took a few moments for her to realize that they probably meant to give them some privacy.  "Oh, I... uh, I'm sorry, I didn't mean to...  I'll be going now..." she said, blushing fiercely.  She didn't move to leave right away however, and from he way she was blushing and fidgeting, it was obvious that watching the two girls pleasure each other was making her highly aroused.