Series: Touhou - Alice to Shinki-sama to Yumeko-san to (Katayama Kei)

Artist: Katayama Kei
Original title: アリスと神綺さまと夢子さんと
Gallery: https://e-hentai.org/g/1678123/0e966b44f3/

Alice steals the yin yang orb in order to use its ability of not getting fat after eating sweets to feast on sweets alongside Shinki and Yumeko.