Split- Daki+ Gyutaro.
Both had turned into demons at the same time. so, both had to learn the basics at the same time. their teacher was crap, although maybe better than none. At least he was an upper rank, which they had learnt meant he was important. Although this man was the one who had taught them that. Douma was his name. for a short while they lived with him as he taught them the basics of being demons, telling them they needed to get stronger, and how to eat and how you could never eat too much. Something that they never even would have thought about before. But now he had a new lesson for them, their blood demon art. Almost all demons had them after they started becoming strong, and you simply were getting nowhere without them. Trusting their luck Gyutaro guessed they'd be the ones who couldn't develop one no matter how many humans they ate, Daki was a bit more optimistic.
Countless humans were devoured until Gyutaro started feeling something that he couldn't describe, like his blood was flowing wildly through him. Somehow, he knew his blood demon art was developing. Daki felt it too, she came running up to him calling his name and seeming so excited, she could feel herself becoming strong for the first time, who could blame her? Douma watched on as the two siblings ran up to each other, arms open wide for a hug. Smashing into the other one.
Did they just kill each other? Douma watched on in some sort of mix of horror and fascination as they collided into each other. Skin seeming to melt and mix into one another. They merged into a mess of flesh and blood. Both were screaming in pure terror. Even as a demon Douma had never witnessed anything like this. neither of them could back up or get out of the mess they had gotten into. For once Douma wasn't sure what to do, so he simply watched on as they screamed in agony and became one mess of skin and guts.
Daki survived. That surprised Douma, he had assumed it would have been Gyutaro that lived if either of them did. maybe he had died willingly for his sister? He just had to ask "where's Gyutaro?" for some reason Daki started crying, but she just didn't seem as scared as he'd expected her to be, maybe she wasn't as attached to her brother as he'd thought "he's speaking to me, I hear him!" she started crying. Now that confused him. what was she going on about? "What do you mean?" he asked, "he's inside me, he's getting out!" she yelled.
Gyutaro somehow knew what had happened, he had mixed with his sister and was somehow hiding inside her. It felt odd, like he didn't really exist, then he managed to talk to her, more like he sent her some sort of telepathic message "okay, I'll fix this, let me just get out" and so he chose to rip himself out of her. Simple really, he just felt where she was. And aiming to rip himself out her back, he started concentrating his flesh into his body, and he heard her cry as he ripped her flesh open to make room for himself to get out, ripping what felt like their souls apart as he could feel Daki's pain. it was horrific but necessary.
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Goretober
Fanfictiona series of horror/gore stories with the character from demon slayer. warning for gore.