I am a 13 year old boy and my sister is a 12 year old girl. We get naked and play when our parents are gone.

It's normal for siblings to be curious about each other and their bodies, especially during the pre-teen and teen years. However, it's important to remember that there are healthy boundaries in relationships. Engaging in sexual behavior with a sibling can lead to complex feelings and situations. If you have questions about your feelings or behaviors, it might be helpful to talk to a trusted adult, like a parent or a school counselor, who can provide guidance and support.