When copy-pasting to start a new fic-idea and have all the styles I usually use, I accidentally found this earlier attempt at "A Grave Misunderstanding". It's basically the same idea as the original, just that Hermione did not manage to warn Harry in time. I thought I'd just leave it here as an Omake, in case someone is interested.
Omake - What if Hermione hadn't warned Harry in time?
"So let me see if I got all of that right." Harry said. Hermione nodded and looked down nervously.
"You found out Ginny, Luna and a couple of other girls want to create a harem for me."
"Yes."
"Without asking me first?"
"Yes."
"And you tried to convince them not to but failed?"
"Yes."
"But you actually wanted to be in my harem, too, but never pursued it because you thought I would object?"
"Yes."
"And since you couldn't convince them not to, you tried to warn me. But they got to me first and stunned me, in order to do the harem ritual?"
"Yes."
"Therefore, you decided to join in as head-harem girl, so you could help me through this?"
"Yes."
"And because you all enacted the ritual without asking my permission first, in exchange you are all bound to be completely loyal and obedient to me?"
"Yes."
"And you are fine with that, too?"
"It's kind of a fantasy of mine."
"Right. And the ritual also gave all of you magical power to rival Merlin and Morgana, physical power and durability to make a whole tribe of giants green with envy and instant magical animagus forms?"
"Yes."
"And since you are my head harem girl, you will take over all the organising and such and I don't actually have to do a thing other than enjoy my harem girls'… presence?"
"Yes."
"So I basically now have a harem full of completely obedient, magically and physically overpowered girls who can turn into dangerous magical beasts at a moment's notice?"
"Yes."
"Hermione?"
"Yes?" Hermione kept her head down, awaiting the inevitable explosion. Harry would hate her forever for not finding a way to prevent the others from making him a harem. He was much too noble to ever accept being with more than one girl at the same time. Otherwise she would've made him a harem years ago.
"I love you."
"Huh?" Hermione looked up, blinking in surprise.
"I said I love you. I don't know why you thought I wouldn't want a harem full of the most beautiful girls in Hogwarts, but no matter. You are the greatest and most beautiful of them all."
"Err…" Hermione continued looking at Harry uncomprehendingly. "I don't understand what's happening."
Harry smiled at her brightly. "Not only did you join my harem, you also were the only one to try and respect my wishes."
It took a moment for Hermione to disentangle that web of questionable logic. "So you are happy about having a harem and happy about me wanting to prevent you from having a harem?" She finally wondered.
"Yes, exactly."
"That doesn't make any sense."
"I'm Harry Potter, I don't need to make sense."
"That's a fair point," Hermione had to admit, "but still…"
"Hermione?" Harry interrupted her.
"Yes?"
"Would you like to kiss?"
"Oh I only wanted to do that for five years."
"Then let's."
Hermione obeyed, though she was pretty sure it wasn't because of the obedience compulsion. Not that she had much time to contemplate it before all her brain capacity was absorbed by the most wonderful feeling she had ever had in her entire life.
When the kiss ended, Hermione was quite sure she was drooling.
"Hermione?"
"Yes?"
"How about we go look for the rest of my harem?"
"Okay…" Hermione agreed dreamily and followed after Harry. She didn't really understand what was happening, but she didn't care either. Though there was one thing that was bothering her a little. "Umm… Harry?"
"Yes?"
"Do you think we could kiss again before looking for the others?"
Instead of answering through words, Harry answered through actions. This was definitely the best day of Hermione's life.