Bobby and his twin sister are the heirs to a vast fortune. Both now eighteen, they've spent their whole lives getting whatever they want, whenever they want it. Some might say this lifestyle has caused them to grow up...a little peculiar. Especially if they knew what goes on when mom and dad are out of town.
It started on their eighteenth birthday; mom and dad had gone on vacation, leaving them by themselves, the whole big house to themselves. Bobby was sitting watching TV, while his sister, Lindsay, lay on the couch, reading a magazine. Lindsay was wearing a bikini top and jean shorts. Bobby glanced over at her, and then took a longer look. He suddenly found himself compelled to stare at his sister's tits in that top. His heart pounded as he watched them move when she breathed. Before long, he was starting to fantasize about going over there and sucking on his sister's big titties, and this caused his cock to get hard. At that point, he decided "What the hell", and unzipped his pants, pulled out his cock, and started to slowly stroke it.
Soon, his sighing and groaning got Lindsay's attention, and she looked up, and saw her brother stroking his big, hard cock, while leering at her. He didn't even stop when he saw her looking at him; in fact, he seemed to get off on her watching. Lindsay, highly turned on by this, decided to go along with it. She undid the string on her top, and took it off, then started to feel herself up. She licked her lips, as she watched her brother jerking off. Her pussy was starting to get wet, so she took off her shorts, then the bikini bottom under them, and started to masturbate. This got Bobby even hotter, as he started to fantasize about eating his sister's pussy.