[I tweaked the blurb a little and will keep trying to build up a backlog. I'll start the other story first.]
Blurb:
Xino Nidhogg accidentally drinks a potion that turns him into a human.
The mighty black dragon (self-proclaimed) and fiercest creature in the forces of chaos becomes a weak and helpless human overnight. Only on nights with a full moon can he regain his true form and the power of a black dragon under the moonlight.
Everyone: I feel like I've heard this story somewhere before.
And then some despicable former god drags him into the human world, casually dumping him at the door of a human who looks as weak as a lamb.
The weak-looking human, a starting setter for Aoba Johsai: ?
"Hey, hey, I told you not to eat the mayonnaise in the house as a snack!"
Xino licks his lips. "But if you leave food sitting there, doesn't that mean it's for the dragon to eat?"
Captured by the evil delicacies, Xino ends up, more or less willingly (crossed out), living with this human who clearly knows how to take care of him (crossed out), and clearly needs him to take care of him.
Xino, having found his owner: "Hmph. I'll help you win the title of King of Volleyball, just this once."
Oikawa Tooru: "...There's no such title."
Also, how can dragons exist in this world?
That's not scientific!
Please read before starting:
1. Xino is an attacker, and his CP is Oikawa.
2. The protagonist isn't even human anymore, so please allow this unscientific world to exist.
3. The title is a reference to a Kobyashi-san series name pun, since this story is a crossover with that series.
4. You don't need to tell me if you drop the story. Just leave. No need to comment.
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Crossover: Haikyuu!! + Miss Kobayashi's Dragon Maid
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Theme: March toward victory