They're on their family vacation and in their own rooms. Until a the thunderstorm that's hit is in full swing. Scared of the storm she goes to her brother's room looking for comfort. Once there he hesitates to let his sister in. Finally deciding that the storm is a pretty bad one, he does what good brothers do and lets his sister in so he can be supportive of her. Once they snuggle up on the bed, he gets excited. Who couldn't be hard with such a sexy sister rubbing up against you. She don't want to think about the storm and he needs to bust his load, so they commence to do what siblings do best and help each other out during their trial. She would rather suck his cock than think about the storm and he wants to let her. By the time its over, he has her bent over the bed and totally over the fact there is a storm outside.
