[Fuyuno Mikan] My Big Sister, the Witch [Full Color]

A little brother discovers his big sister is a witch, and her magic wand comes with a very hands-on demonstration. Shrunk to miniguy size, he's pressed into her enormous soft breasts, teased until he's squirming, then given an up-close invitation to the slick place between her thighs where his whole body might just fit. One slow unbirth later, she seals him inside with a protective spell and settles in for a night he isn't allowed to escape.