Anko3781: Dosu Maricha Reboot (apparently this is an extended version of a previously written story)
A Komarisa wakes up in a strange place, but dozes off again. The last thing she says before nodding off is that she's a Dosu.
Some time later, her parents are looking for her, and find Komarisa, who proudly proclaims she's a Dosu. Being parents, they indulge her fantasy, though she quarrels with her little sister Marisa over it. That's when two boys show up.
Displaying their usual arrogance, the Komarisas make fun of the boys, Komarisa going so far as to say she'll Spark them. However, her attempt to do so is accompanied by her wetting herself, which the boys make fun of. Then one of them decides to make Komarisa a 'Dosu'.
He kills some Koreimus who're nearby and take their ribbons, kicking away their mother Reimu, and put the ribbons on Komarisa. Even as she's panicking over the smell of death, the boy decides that she's not fat enough, and starts forcing her little sister into her mouth, which he manages after a lot of pushing and stretching. To finish it off, he writes it on her body as well.
Later, the parents find Komarisa, swelled up and on the verge of insanity, and try their best to lick her back to normal as she babbles about being a Dosu.
Elsewhere, a female researcher concludes that the mental suggestion method of trying to make a Dosu is a failure.