魔女っ娘シルク

"Majokko Silk" is the story of Silk, a sexy witch from another dimension. One day, a witch named Silk suddenly visits Takashi Sakuragi's house...She's from another world! She has a beautiful face, gorgeous blonde hair, and a very attractive body with intriguing clothes. Takashi is astonished by her beauty, but it's only the beginning of his extra-ordinary life...

[from a post on TetraHentai forums]