Synopsis
One day, Shoko’s younger sister suddenly develops a penis.
Shoko cries to her older brother about what to do with it.
The brother, who had always viewed Shoko in a sexual light, sees this as an opportunity to sexually toy with her…
The brother teaches Shoko how to stroke her penis, and introduces her to the dual pleasure of both vaginal and penile stimulation.
Shoko gradually transforms into a proper futanari girl…
With her impressive member, she opens up her best friend, and learns about vaginal sex while having her penis stroked.
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