Step Mother Friend's (Friends With Benefits). Friends WIth Benefits

Sam Black's heart pounded in his chest as he watched the private video unfold on his screen. The figures of Emily, Freya, Kate, and Laura, his stepmother and her closest friends, were unmistakable. They were the women who had been a part of his life since he could remember, offering warm hugs and sweet smiles. But now, they were before him in a way he could have never imagined, their bodies entwined with a mystery man, their moans of pleasure echoing in his room. The man in the mask was receiving the kind of attention Sam had only ever dreamed of.
Freya. Kate and Laura flanked her, their hands stroking the man's thighs. Emily watched, her eyes alight with a fiery desire Sam had never seen in her. Sam's own desires were a confusing maelstrom. Anger at the betrayal, shock at the revelation. The video ended abruptly, leaving Sam in a state of turmoil. He knew he should confront Emily, but the thought of facing her after seeing her like that was too much.
Instead, a plan began to form in his mind. If he couldn't have the truth, he would have revenge. And it would start with Freya.