By the horns (Pixiv Fanbox)

There are some things one should never do outside the dungeon, because it may lead to dire consequences. One of those things is forcing a demonic entity to suck you off by grabbing her by the horns. The dungeon, however, as you may know, is keen on disrespect, humiliation and showing its trainees their place within the dungeon hierarchy, so just about anything flies that gets the job done. This demon here has been especially bratty in the past. Talking back regularly during sessions and generally being a nuisance to work with. It seems as if her head trainer has had enough, as her mouth has been stuffed all day already by anyone who feels the need to release some build up pressure~