Vignette in Vignette

Vignette is a witch who lives in the laboratory of a sandbox world with her naughty apprentice. These sandboxes are scattered all around the world and have the power to trap the souls of otherworldly travelers. Vignette uses the tentacles she grows to torment the girls who also inhabit this world, and becomes a futanari to violate them over, and over again. She doesn’t realize it but there is a reason behind her actions… One day, her unattractive apprentice goes missing, along with the mysterious green seed that was in the lab. All that remained was a letter.
“If you want to see your apprentice or that seed again, come and get them.”
Vignette heads off to find the person who wrote the letter and retrieve the seed. And she supposed it would probably be good to rescue her apprentice, too…
She could not have imagined what lay ahead.