You should know someone stole this art of yours. [link] this person's gallery is riddled with illegal images, some of which were taken from other deviantart fanartists. There's quite a list.
After trying to talk to this person peacefully, he screamed at me (he was falsely polite in the beginning) calling me names of various swear words and blocking me.
I am notifying all of the stolen art I can find. This thief has been caught on multiple occasions and doesn't seem to stop. (and I'm not even counting all the screenshots in the gallery... I don't really care if people post screenshots, though I don't do it) Even if you ask him to credit you, that will not stop him from doing it again.
If you're OK with my request, please report this person's stolen deviation. He should not be allowed to steal from anyone, and this is a cute picture. You worked hard on it. Help to put a stop his constant stealing.