judging from the lower half it doesn't seem like one ... the artist does draw mostly guys, so I'm not sure ... just leave it to your imagination (It ain't real anyway so who cares what it is)
Actually, I have the trap tag blacklisted. I saw the pic before the tag was added, and didn't close my browser window. I didn't even notice the tag until I opened the artist's tag and saw that the pic I had just left wasn't showing. Is the character from something or are there tags on pixiv to say it's a trap? Because the evidence in the pic itself is pretty much against.
Actually, this is the same guy in some of the artists other images where he is a GUY with a huge ass. I'd say that's proof enough. Also, I'm almost positive this image has the shota tag on Pixiv.