This is a lovey-dovey ecchi manga about a childhood friend who grows a penis when she sees the full moon.
From artist Aki Amare comes a story featuring Rouna-chan, your futanari childhood friend. On nights of the full moon, her body starts to ache and she transforms, gaining a new anatomy she can't control.
Completely obedient to pleasure, watching her give in and fully enjoy herself is great to see.