A more ghostly sort of demon known as a Putti, or Devil Cherub.
They're horrible little bastards that float around, grooming and antagonizing young women mentally with sweet pregnancy dreams and fantasies until they're receptive to their influence, until they insinuate in their bodies and bully them into giving birth to them to give them physical, mortal bodies to inhabit.
Witches however are wise to their game and don't tend to fall for it, so much as contract their work or exorcise them from their bodies. Where they act as familiars.
What you're seeing is a witch and her temporary familiar.