When mom and dad are away the twins will play - with the each other, with the babysitter, with the coach, with girlfriend to girlfriend and as a foursome.
Keith Partridge is the lead singer in a rock band, which sounds cool. Except that most of the other members are little kids. And, oh, yes, his mom. Steamed by the restrictions this places on his attempts to be a rock star, he goes into his mom's bedroom to confront her. Surprised but aroused by what he sees, he takes matters into his own hands. She is initially upset but eventually decides it wouldn't be a bad idea to get to know her son in the Biblical sense.
A wife gave her husband a surprise birthday gift where she wanted to be a submissive for a day. As the day unfolded, her daughter unwittingly joined in, and the more submissive she became, her new role morphed into a daily routine. Her school mum's friends adored her husband, lusting after his cock. Agreeing to let her hubby screw them caused benefits for her after he publicly humiliated them.
People have been making the beast with two backs for hundreds of years. Malkyn and Leo, teenaged siblings in the winter of year 526, accidentally find themselves doing exactly that one cold winter's night.
A naive couple joins two swinger couples for a summer fun day in a water park then an adult hotel. They don't object to the stripping rules for the mini golf game for a reason. They later get lessons in oral and fingering.