Bewitched! ~The Witches of Remlia~

After the protagonist's mother was killed via witch hunt in his village when he young, he and his father escaped. However, his father disappeared soon after, and he was left to live alone far off in the mountains. But one day, a certain curse befalls him, and he is spirited away to another world known as "Remlia". The lewd witches of Remlia seek to turn the protagonist's spirit into magical energy by making him a pleasure slave, but...will their plan succeed?