Witches, please stop thinking about me!

One evening, Lin Jiu accidentally stumbled into the Otherworld, becoming a demon male unlike any other before, and encountering his first witch. Caught in the crossfire, Lin Jiu, desperate to survive, unwittingly began his first... fusion with the witch! Good news: After fusion, the witch was greatly enhanced, and the two successfully escaped the Otherworld. Bad news: Lin Jiu's power comes at a price. After the fusion ends, his ability will have some effect on the witch's mind and body... Lin Jiu's Usage Instructions: First, do not use me as a plug-in! Second: My side effects are significant; consider them carefully. Third: If simultaneous use is necessary, please clarify the relationship beforehand; multiple users are prohibited from using me together! Exceptions apply...