A knock on the door

Rebecca took a quick shower and was just getting out when she heard a knock on her door. She had been listening for the buzzer on her intercom to let Kelly in, but figured Kelly must have just slipped in with someone else coming or going in the building. She grabbed a towel and wrapped it around her glistening body, tucking it underneath her arms, and made her way to answer the door. Looking through the peep hole, no one was in sight. Rebecca undid the locks, saying "Very funny, Kelly. Get your ass in here..." as she opened the door.