New year problem: when I went to a bath in my parents' home after a long time, my sister grew up. In addition, "I will join you", and invaded innocently naked. The family is coming up soon. How do I do this?

The best novel of the series that the temptation of younger sister confuses the man. I met my sister when I decided to go to the bathroom in my home after a long time. It's time to get together, but it's time for relatives to wake up. However, the interesting sister in the man's body invites boldly to the daisy. It is thought that it is not possible to put out the hand but erection is erection. Can you keep reason?