Im sure of the artist style: ke-ta

But searching this artist in Danbooru, I got this post #1224142

Looks like someone (probably not ke-ta) just edited the original to me.

So those are the parent images. I knew there was something going on.

This is a shop that most likely originated from http://ecchi-paradise.tumblr.com/post/109754424334/ecchi420hentai-ready-to-rumble

Boxing Youmu....ok, that's weird