Honest critique if you're going for this 'corrupt innocent Bill' story;

You should really give more details on our speaker's reputation. It's obviously bad enough that Tom doesn't trust her but, what has she done exactly? How did she and Bill become friends? Why hasn't Tom ever confronted Bill about her being a possible bad influence? I'm not even sure how long they've known her. If she's been their friend since childhood, how is it that she's grown up to be so much different than them. Overall, I don't understand any of these characters, what it is they want, what the story's leading towards, or who I should be invested in as a reader.

You have a concept that can be done really well. Consider adding some detail to these characters.