Fapping for our Vietnamese exchange student Cindy

Your Vietnamese exchange student is so grateful for the hospitality you and your household have shown her. She has chosen to use the American name of Cindy. She is still learning about America and she has a lot more to learn. There are some slang words that she is confused about and she hopes you can help her a little. What does "fapping" mean, anyway? You show her the jerk off gesture and she understands instantly what that means. Do you do that? It is something that she is fascinated with and she wants to know if you would do it for her. As her temporary step-brother, you want to make sure she feels at home. You show her your cock and she is impressed with the size.