AN: I hope you like this alkjira
The idea thing I chose from her Stories I'm Not Really Writing Or: The Ideas Won't Leave Me Alone!
Mahal and Yavanna are born as Thorin and Bilbo. They pissed Eru off and now they're punished by living like mortals for a lifetime. Eru hadn't intended for them to find each other but go figure.
Bungo and Belladonna could not actually get children together, hence Bilbo being an only child (without Eru meddling there'd been no kids at all)
And Mahal/Thorin ends up in the line of Durin because of reasons. Depending on how big of an arse you think Eru is it's possible he knew that Smaug was coming and wanted to teach Mahal a lesson about something related to that.
Maybe they remember who they were, maybe not, maybe they regain their memories after a while.
Eru was not a happy camper. One would think that as a being who sang life into the world he'd be a very happy person. But no. He was very grumpy and that was mainly because of two of his children, who may or may not actually be his children. Manwe stares up at him, pleading with out words as the shouting becomes louder and louder. Ah yes, the honeymoon phase has finally ended for Yavanna and Mahal.
"Please, please make it stop. Not even Irmo can get any sleep."
He was not supposed to be playing peacemaker to the Valar and especially not a marriage counselor!
"Begone you harpy. I hold no love for you!"
"You hold love for nothing. If you did you would do something about their prayers."
"Like you did with the Ents? You heard their cries and yet you did nothing. My race is meant to survive. Yours are not. So is it really I who is heartless?"
Eru stands anger in his veins. Had Aule not heard his wife's screams as the fires licked her own skin? Had he not heard her singing, trying to create something to keep the Wives and Entlings from dying?
"Yes, yes you are the heartless one. There are days where I wish Eru never gave you your Dwarrows for you do nothing to help them. They were better off as useless bit of stone!"
And so Aule is not the only one who shall be punished for that was a low blow as well.
"ENOUGH! I grow tired of hearing you bicker. What happened to that sickly sweet couple that caused the others to smile or gag because of the love? I have had enough!" Eru roars his voice echoing. He points to Aule and starts to chant. He sees something flash in Yavanna's eyes right before she steps in front of her husband and his spell completes. Eru grumbles slightly and alters his spell just slightly. He would not be letting her off lightly because she sacrificed herself. Aule's face is slightly priceless when his wife disappears and Eru says another spell.
Those two shall be forced to live as mortals, growing, breathing, perhaps even loving. At first he had planned to make Aule suffer by making him be a Hobbit, weak in body and Elf like in appearance something that is sure to rub Aule wrong. He doesn't have the Dwarrows hate for Elves but he is still slightly bitter. But alas, Yavanna shall be born to a family who would otherwise never have any other children much later. And Aule would be born into a family… Maybe a Durin. They are Kings and will be a perfect way to teach Aule to love more than himself. He shall be born first and they shall be without their memories, having an immortal amount of memories plus their new memories will be too much. Although they could slowly get them back… Nah.
With that done he looks back at Manwe.
"Are you happy?"
Now he will have peace.