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(Her Secret Fantasy, continued by Emma...)

“Okay, I’ll do it on one condition,” you say, hoping that your girlfriend won’t stop stroking your penis just yet. In the meantime you try to think of the one and only condition that would make her change her mind, and take back this silly idea. It’s taken you years to forget your shameful dalliance with your step-sister Amy and you’re afraid of what might happen if you reignite it.

“I’ll have sex with you and my sister if you agree to…” You pause for dramatic effect.

“Yes, what? Anything!” replies Rachel eagerly.