Betty didn't know it, of course, but she was moving her sucking mouth forward and backward on his cock in practically the same rhythm as Mr. Anderson was pronging their sexy mother, Norma. He'd often thought of his sexy mother by her first name since he'd first seen her sexing it up at one of the swapping parties. He'd caught himself just in time on many occasions to keep from calling her Norma to her face during the past year or so. And Betty had mentioned that she'd had the same problem when around their father, Bill.

He guessed he'd seen his mother doing just about everything there was to do of a sexual nature with a partner or partners, female as well as male. He'd even seen her finger-fucking herself while temporarily without as partner.

At first, he'd beat his meat while peeking during the many sex parties his parents had tossed at their home. Then, after several weeks, unable to keep the secret any longer, he'd told Betty about sneaking back to the house and observing the erotic activities and acrobatics.

His sister hadn't believed him at first. And he didn't blame her. Around them their parents were straight-laced and puritanical where anything having to do with sex was concerned it was still sometimes difficult for him to believe that they were actually such sex nuts.

Rod had to believe his eyes, though, and Betty did, too. She had been the first to suggest that they should also start enjoying themselves in a sexual way. Together. She'd admitted to masturbating – and had told him that she knew damned well that he was jacking himself off after he admitted that he'd never fucked a girl.

Betty had never had sex with anybody, either, and after they'd peeked at the fucking and sucking at the sex party together she'd sucked Rod's cock. That'd really felt great, and she claimed that she'd enjoyed the experience, even if she had choked and gagged on his spurting jism.

Pulling away from his gushing cock, she'd dashed to the bathroom to wash her mouth out, and he'd had to finish himself off with his hand.