Guilty Gear doujinshi by Kimuchi/tetsu. Shared on r/salty subreddit on Reddit by user Sckeyth. Pictures taken by hand on phone because he doesn't own a scanner, tripod, etc.
Artist links: Pixiv: https://www.pixiv.net/member_illust.php?id=91679 Blog: http://onibuchi.blog.shinobi.jp/ Twitter: https://twitter.com/tetsuharu0402
Preview of this doujinshi on his Pixiv: https://www.pixiv.net/member_illust.php?mode=medium&illust_id=51938436
@AriesWarlock The same guy on Reddit has some other doujins from Kimuchi as well. Another one of his uploads has been shared here: /g/1231104/2bc630281a/ He also shared a picture on Reddit that shows him owning at least three more: https://i.imgur.com/v0DEVgo.jpg but he hasn't uploaded them anywhere as far as I know.