"Oh please! You're telling me that you two are going for a dance at Back Door, then off to the cabin for a weekend and you're saying neither of you have dates?"
"That's right Mom."
"I'm calling bullshit on all that, Sophie. You are both hooking up with people and having sex at the cabin."
"We're not."
Technically, it was true. We were planning to fuck each other, not other people.
Mom examined me, scanning body language ticks and expressions she knew so well. I couldn't hide, nor should I have to if her theory were true, but it wasn't and I needed to conceal the truth.
"Look, sweetheart. So long as you take precautions when hooking up, I don't mind but please stick to your story with Dad because he'll believe it and prefers to think of you as a virgin."
"That ship sailed a long time ago, Mom."
"Not in the mind of the guy who taught you to ride your first bike."
I was excited to have Mom's consent but couldn't show that too much. I'd probably raise suspicion if I spent the rest of the day in Ethan's bedroom, so I shouted in on my way by, told him our weekend away was approved, and scurried back to my room where I could pack and plan.
Ethan had another idea, opening my door silently a few minutes after the dust settled, slipping in, and closing it behind him. I spun around from inspecting a pile of scanty underwear and felt excited seeing him, then terrified that we might be discovered.
"You can't see what I'm wearing tonight, brother."
"I've seen your panties before sis."
"Oh fuck, don't say things like that. It sounds borderline perv."
"I have a few pairs of yours stashed away in my room, Sophie."
"Oh fuck, Ethan."
I screwed my face into a contorted, lewd mess, smiling lasciviously like the naughty slut hiding somewhere deep inside.
I wanked off my brother... no hold on, step-brother.
Fuck!
He danced through my room, sweeping me up in classic Jazz big band Charleston style. Ethan's arms swung from side to side with rapid forward steps and heels alternating backward kicks.
Mom taught both of us all the old-style dancing, including Cakewalk and Broadway. Our friends teased us mercilessly until jazz club Back Door opened in town, whereupon a queue formed outside our front door made up of people eating humble pie.
When I fell into his arms, Ethan cradled me, leaning in, panting vigorously but kissing me gently anyway.
"What's happening, dear brother?"
"I'm falling in love with my step-sister."
"I love you too, Ethan but this is seriously dangerous and taboo shit."