Maybe...

You looked from Larry to Anne to Cindy and back to Larry. Larry was a big boy and could take care of himself. There was no denying Cindy was a flirt. She could even be a bitch, especially when drinking. However, she wasn’t sadistic. No doubt what she had in mind for Larry and Anne might be embarrassing, maybe even it wouldn’t be anything too bad. There was no reason for you to get involved.

On the other hand, Larry was your friend. You certainly wanted to help him. You didn’t give a rip about Anne, but Larry did. That was enough to make you willing albeit not eager to help her.

Besides, you were bored. You and Cindy oft challenged each other;
especially when it involved a boy. You wouldn’t mind putting her in her place. On the other hand, you didn’t want to be the one who was put in their place.

You grabbed the flask from her hand. You took a long healthy pull on it. The fiery liquid burned all the way down. While it loosened you up to the point you were more than willing to accept Cindy’s challenge, it didn’t make you foolish enough to accept it blindly. You wanted to know more. You asked Cindy what she had in mind.