Cheated step-sister's revenge

Description: Your step-sister's boyfriend has just cheated on her with his own step-sister! how is that possible? she is going to dump him but she is genuinely freaked out! wow, do men really have this type of attractions towards their step-sisters? what about you step-brother? you surely have never lusted after your step-sister, right? what? you have? in fact you have been fantasizing about her? that's shocking! now that she is thinking of it, having sex with her step-brother would be the perfect revenge towards her cheating ex! and your girlfriend doesn't have to know anything! can you help your step-sister with her revenge mission?