What if nezuko and tanjiro were raised by Obanai and Mitsuri?
Whoa, I have never considered this. Let's assume an altered timeline, so, say, itty-bitty Tanjiro hid with almost-walking Nezuko in a closet when a demon killed their parents. Mitsuri and Obanai, who like one another and have sort of figured that out by they are awkward about where to take it from there (since Mitsuri doesn't want to make the first move but can't figure out why Obanai won't), arrive on the scene, and Kaburamaru finds the hiding children.
Mitsuri is instantly attached and wants very badly to make it up to these orphaned children whom she failed. Obanai is trying to tell her why that idea is irresponsible, but Kaburamaru has already become fiercely attached to the terrified children who find comfort in the cuddly snake. It's not as if Obanai can't relate to that, so he gives in, on the caveat that they will take care of them only until they can hand them off to someone more qualified.
They're first thought is Shinobu, but she already has her hands full. They ask the Kakushi, but the Kakushi insist that this is out of their skill set. They think of asking Ubuyashiki but don't want to bother him by setting a precedent. No luck at Wisteria Houses they come across, who are already doing all they can. Wishing to find someone with experience to adopt them, Obanai makes a desperate visit to Shinjuro, who yells at him to take responsibility and get what was coming to him by so idealistically becoming a swordsman. He announces to Mitsuri (who is already very attached) that they'll see their responsibility through.
Since the Kamado children stay at the Kanroji estate most of the time, this is what gets Obanai to finally meet her family, which pressures them more into considering the state of their relationship, especially they Obanai spends time with the children out of a sense of responsibility and Mitsuri, once the decision to keep them was made, wants to spend as much free time with them as possible. Being in a coparent relationship also forces them to confront Obanai's issues.
Both toddlers take to Mitsuri readily, and they like Obanai too, but they both (especially Tanjiro, who can talk better) are sensitive to him being sad. Obanai is nice and tries to be child-appropriate but answers very plainly and honestly when Tanjiro asks why he's sad, thinking that this is out of respect for a child's intellect. Poor Tanjiro wants to help but is often confused. Obanai is a little annoyed how buddy-buddy Tanjiro and Kaburamaru are but he allows it. As Tanjiro grows up and the snake gets older, Kaburamaru spends less and less time in battle with Obanai. Tanjiro is a dutiful son whom Obanai figures pucked up a lot of traits from being raised by Mitsuri, but he reminds Tanjiro to always be grateful to his original family who loved and protected him too. This makes him supportive (albeit concerned for his safety) when Tanjiro says he wants to fight demons too. Tanjiro eventually picks up Snake Breathing, though Obanai points out that he's not totally suited for it. (If it weren't for how annoying he finds Giyuu, he would suggest Tanjiro try Water Breathing.)
Mitsuri is less supportive because she worries about Tanjiro's safety. He is her wonderful son whom she loves very much, after all. But if he's sure he can accept the risks, she allows him to try.
Nezuko has grown up babied by her unckes and aunts and does not know the responsibility of being an older sister. She always wants to be just like her mom (but Obanai sternly put a stop her dressing up like mom, which made little Nezuko cry because she didn't understand why he was angry). She wears fancy kimono and makes sweets and wears long braids and goes to school, and is a dutiful and sweet daughter as she grows up. Despite having riches, this does seem to go to her head, and she still practices humilty and thrift, which really endears her to Obanai. He originally was a bit more standoffish from Nezuko, but Nezuko feels secure in his care for her even if it's nothing like the open, loving, huggy relationship she has with her adoptive mother. When Tanjiro picks up the sword, she insists on learning too, but Tanjiro and Mitsuri don't want this. Obanai lets her give it a shot, but she's too fiery for Snake Breath, and not physically capable of Love Breath, despite how much she has always done her best to imitate mom.
So Nezuko finally does something a spoiled brat would do and she runs away to ask Uncle Kyojuro for Flame Breath training. This causes a brief argument between Hashira but it is soon settled, and Tanjiro sort of wishes he had thought of that before getting so deep into making Snake Breath work for him. Tanjiro & Kaburamaru and Nezuko eventually go through the Final Selection together and begin a sibling journey to avenge their birth parents, with their adoptive parents giving them their blessing and watching over them from afar.
And then, having seem that through, Obanai is finally ready to get married.
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Ngl I love the baby 21 trio especially baby obanai he's so cute. The au gives me brain rot especially thinking about your baby hashira fic w little mui. So that's where I'm getting my inspiration for this thought: but mitsuri taking baby obanai out to a restaurant she and him have been before and people think he's her son especially bc they've seen her with obanai so they're like that's clearly his son 😅
especially with Obanai’s eyes oh its so over for them
the staff of the restaurant swarms Mitsuri like oh my god FINALLY we thought you two would never get together. where have you been hiding this baby from us huh. and where is the father anyway. is he tired of paying for your meals. is he letting his wife and child starve.
and Mitsuri is fighting for her LIFE trying to come up with a story thats literally impossible to believe because, again, Obanai’s eyes are a dead give away
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