>>24568307 (OP)Have a male friend character throughout the opening of the book, he obviously wants her, but she sees him as just a good friend. In the scene the step mother has her tied up and blind folded in a kind of sex swing, shes expecting the step mother to start touching her etc but instead she reveals that she has arranged for someone else to use her, the step mother then leaves to watch on a camera.
We reveal to the reader that the step mother has taken her phone, posed as her then texted a sexually explicit photo to her male friend and arranged for him to come over and fuck her CNC style.
The friend then arrives and starts by quietly eating her pussy then begins fucking her blindfolded and gagged, quickly she realises it's her male friend by his voice which horrifies her, but her body responds more and more, confusing her, the gag preventing her from crying out to him. After a while he decides to take off her blindfold and gag but when she protests he thinks it's part of the CNC game, he's violent and forceful it's not until he's drained his balls does he actually listen to her cries. Maybe the step mother comes back in and does something else depraved.
Something like that. You gotta add in what would a girl finds repulsive for horror. Being passed around by a roomful of hot adonis body chads with big cocks isn't going to cut it for dark/horror erotica. This is also partly why girls/women watch so much real murder content.