[Ekogi] What if My Shut-in Sister Grows a Penis?

What if my shut‑in sister grows a penis? sets the premise as a shut‑in sister suddenly develops a penis, prompting a shocking encounter with her sibling. The story follows her eager anticipation of a long‑awaited package, the moment she discovers the new anatomy, and the ensuing painful yet pleasurable struggle that culminates in a raw, on‑hole experience. An afterword reveals the creator’s intent to explore dark, incestuous futanari fantasies.