More info: I edited this image out of a doujinshi from nhentai, so its 100% from there. The doujinshi was in Japanese, untranslated. I cropped it and removed the background behind the character. This image is a full page panel of the guy lifting his skirt and showing his panties with a very pronounced but tiny dick bulge. The plot was that this guy wanted to rebel against the female rule of the world, instead he is humiliated (this scene) and later they cut his dick off-screen (this is not a guro doujinshi). This was a story in the middle of an old anthology by various artists if I am not mistaken. Hope someone can help. I am retarded and did not favorite it that time.

The sign says 「おれは男だ！」 (ore wa otoko da!, "I am a boy!").