If they start to play the games you speak of, let it happen (If you want to, not if you feel youre obligated to) 🙂 Let the fun begin! It will add a fun dynamic to the night. But if you do get some alone time, and it feels right and not like an out of place discussion, I think its not a terrible idea to at least plant the seed in their brain about the potential of liking pee. I'm no expert, these are just some ideas 😛 I don't wanna get anybody in trouble! haha