In late May my Dad, Step-Mother and Step-Sister went to the beach for a week I’m 18 and my Step-Sister is 14. One afternoon our parents made a grocery store run. We stayed at the condo planning to go to the beach. One thing led to another and we ended up haviong unprotected s**. She told me a couple of days ago that she hasn’t had a period since we got back. I don’t know who will be in more trouble but expect it will be me although she wanted to do it.