It's a great question, and you have to remember to touch the girls and build good kino, and always remember to escalate your relationship as you enjoy making the girls laugh. If you are having a good time, and building attraction, having her laugh and bond with you emotionally is not going to be a bad thing.
One really good side effect of her enjoying herself is the MASSIVE validation she is giving you with her demonstration of your social value (you are an incredibly fun guy, see?).
Keep it up, and do more with it!