Things escalate quickly

Mike is so focused on eating out his sister's pussy that he barely even notices his mom laying down on the floor and positioning his legs on either side of her head so she can slip her son's cock easily into her mouth. Once her lips wrapped around his stiff member though, he became suddenly acutely aware that his mom is sucking him off. By now though, he is way passed being grossed out by the whole situation and is just enjoying the moment. Mike starts to moan with pleasure into Rose's pussy, which in turn makes her moan and rub her crotch even harder against her brother's face. You encourage their mom to pick up the pace, and soon she is sucking her son's cock in earnest.

You watch the incestuously erotic scene escalate in front of you until finally Mike hits the point of no return. His face screws up and his body tenses up, and suddenly he muffles a long low moan into his sister's pussy as he floods his mom's mouth with cum.

This pushes Rose over the edge too, and her young body writhes in ecstasy, squirting and smearing her pussy juices all over her brother's face. Mike nearly suffocates smothered in his sister's pussy and drowning in her girlcum, but all this does is make him even hornier. Somehow, he holds his erection even after he's finished cumming in his mom's mouth.

Their mother, who interestingly enough is the only one of the three that you actually directly influenced, is slowly starting to shake the erotic haze you used to cloud her mind and is now staring in disbelief at what her beloved son and daughter are doing. Then she notices her son's cum dripping from her mouth, and suddenly she recalls in horror what she just finished doing to Mike's adolescent cock. She wants to run. She wants to cry. She wants to vomit, but all she can do is stare silently.

Rose releases her vice-like grip on Mike's head with her thighs, and Mike pushes his sister down on her back. She eagerly spreads her legs for her brother, and he penetrates her down to his balls with one swift thrust. Brother and sister stare into each other's faces as they fuck with wild abandon in front of their petrified mother. They go through several positions; cowgirl, doggy-style, wheelbarrow, and so on until Mike finally plows deep into Rose with her legs hiked up onto his shoulders and lets loose a torrent of cum, ejaculating straight into his sister's womb.