My Sister Doesn't Know I'm a God

My brother is a psychopath from a higher-dimensional universe. The first thing he did after his resurrection was to build me a mobile phone that could edit the parameters of reality, and then he sat on the sofa and waited to see me screw up everything. I changed myself to be the best in the school, and he sent the repair broadcast to the whole city. I created a candy civilization that added intelligence points to mosquitoes. He said he was on vacation. He said that he alone can bully my sister. The only kindness he showed was that when he took me to fly to Proxima Centauri for fast food, he didn't let me pay the bill.