Capricious Valpurgis is a Manga/Manhwa/Manhua in english language, Ecchi series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

The boy born with white hair and purple eyes who was called "Demon Child", Alse, that day met a witch in the middle of the forest. "Do you wish to die here weeping? Won't you make a contract with me and live as my servant for life instead? So, what will you do?". The witch, white wolf, and "Demon Child", the three's magical and mysterious life begins!