House-Elf in Harry Potter

SI transmigrated in a house elf. At the beginning he is going to look like any other ordinary house elf, but that will change in the future. He will also eventually become very op in the future. ============================================= English is not my first or even second language, and I suck at writing synopsis. So, read at your own risk. If you find any mistakes then please point it out and I will rectify it.