Twin brother and sister

Sister is a gymnast, they live in a family where half nudity is no big deal, especially amongst twins. Sister is a late bloomer and has recently developed a smoking hot athletic body from gymnastics, that brother only notices now, in the shower.

further ideas:
- Brother keeps hiding his erection from her, maybe grabbing her waist to stop her from turning around.
- Brother has a fetish for bellybutons.
- Sister jokes she is still flexible, leaning backwards until her face is upside-down at eye level with him. She might do a standing split, perhaps jokingly reaching for the soap with her foot.
 
Here is a story I would like to see: A twin brother and sister in the shower together.

That's not a story; that's a snapshot. A story needs an arc: a beginning, a middle, and an end.

That said, it is a hot little snapshot. They say twins can often finish each other's sentences. Maybe that can be the hook:

"Sis, can you give me..."

"A blowjob?"

"I was going to say the shampoo, but that works, too!"
 
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