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In order to stay away from their past, the Uzuis move into a little village near a mountain. The people are really nice there and the most important part of it is that nobody knows them.
They get used to the lifestyle there, not as flamboyant as Tengen would like it to be, but it's a place where they can be happy while he fulfills his duties as a hashira.
One day, while Makio, Suma and Hinatsuru are in the center of the village to buy food, a beautiful boy, probably eighteen or a bit older, comes with a basket full of charcoal.
He has long hair tied up into a ponytail, his face is a little bit dirty because of the charcoal, his clothes are not expensive at all and most likely were given to him by someone who didn't need them anymore...
But the truth is that he looks adorable. His smile is like the Sun and his eyes glimmer with kindness all the time.
Also it seems like everyone around knows him because they call him by his first name.
"Tanjirou!" The woman who sells the fish waves at him. "Come here, I need some charcoal."
Suma fixes her hair without even realizing what she's doing and Hinatsuru gets a little bit flustered when the redhead comes closer to them. Makio doesn't waste time and offers to buy the rest of the charcoal after the people around get what they need.
"Really?" Tanjirou beams, making the three of them blush. He introduces himself and after they do the same, Hinatsuru invites him to their house to drink a cup of tea. "That'd be really nice, but I live on the mountain and I don't want to–"
"Please, just for a couple of minutes," Suma pleads, almost tearing up, which makes Tanjirou give in.
Tengen comes back while they're drinking tea, the women introduce Tanjirou to their husband feeling a little bit guilty for some reason, but then, as the sound hashira kneels next to the redhead... his demeanor changes.
It's surprising, but Tengen gets a little bit flustered. He reaches for Tanjirou's cheek to wipe a little bit of dirt from his face without realizing what he's doing until it's too late.
"Sorry! You h-had something on your face," Tengen stammers, prompting his wives to watch with fascination and amusement.
"Thank you!" Tanjirou smiles at him, looking like he's truly grateful indeed. "Well... I think I should go. It's getting late and I have to walk a long way."
"I can take you," Tengen offers immediately. "I'm really fast, we'll be there quickly."
"That sounds very kind of you, but I don't want to be a bother... Thank you for everything!"
They insist, but Tanjirou is determined so they let him go and as soon as he does, they are left with a very surprising realization: they all have a crush on the boy.
But they don't acknowledge it, thinking it'll pass. It can go away, right? Sure they're happy together and they certainly shouldn't need anyone else. The four of them love each other and they have never looked at anyone else twice but... Tanjirou is just so kind and warm... Hinatsuru feels her face like it's on fire and glances shyly at the others only to realize they're blushing too, even Tengen... And they all know they're blushing because of Tanjirou.
But no one says a word.
However, they keep welcoming him into their house, because they can't help themselves. And of course, their crush grows into something they cannot longer control.
Tanjirou starts patching Tengen up when he comes back from a mission (the boy has no idea what the tall and handsome man does for a living, but he doesn't ask). He helps Hinatsuru with the food, he helps Suma calm down when she needs it and always compliments Makio on her fighting skills whenever he finds her training.
There's no way to deny it anymore; they all have caught each other staring fondly at Tanjirou more than once, they have started to smile more... hoping to deserve something so precious as Tanjirou even after all the things they have done.
They become bold after a while because they can't help it anymore; Suma kisses Tanjirou all over the face as a form of greeting, Hinatsuru rubs her nose against the boy's, Makio wraps herself around him and sometimes cuddles with him.
Tengen... He is constantly sitting Tanjirou on his lap and nuzzling against his cheek until the boy giggles happily.
And yet, Tanjirou seems to think they all are very good friends.
The villagers know what's going on (because the Uzuis are not very subtle) and have threatened them with death if they hurt Tanjirou; everyone in the town seem to love him dearly.
And then... They meet the family. The Kamados are intimidating when they want to be; Tanjirou's mother knows what's happening as soon as she meets the Uzuis and warns them they have to prove themselves first before she can give them her approval. The siblings are not easy to win over either, despite being younger than Tanjirou, they all are very protective of him, especially Nezuko.
But Tengen and his wives can be very patient and determined when they need to be. They'll prove them they are worthy of the boy and then they'll marry him.
Because they have realized they want to spend the rest of their lives with him.