There's no mention of her being a dragon in the translation here, nor on the pixiv page when I use the google translator. There are repeated mentions of "devil" though so I edited the tags of her and her busty counterpart accordingly.
She can shrink and grow her wings by varying the flow of magical power to them.What are you looking at?Simple innerwear.Kuroa
Devil Summon Character No. 1The main heroine's devil. She appears well known in the spirit world. She has such a fascination with the human realm that she violated the treaty in going there.