Sydney is pleased that her tease is working so well. She can see that you can barely keep your eyes off of her breasts.
So, casually, she unbuttons her top, saying:
"Sorry, I can see that this gauzy see-thru top is teasing you too much. I want to be fair, after all, since you have no beads left..."
And when you finally look up from her breasts, she knows from long experience just how to look at you to get your juices flowing.