After the Infinity Castle battle, he survived the whole ordeal and during the last Hashira meeting with just Giyuu, Kiriya made a small joke about him finding a nice wife, having children with her and leaving your blood so if demons reemerge, his children will save them or something like that which Sanemi obviously didn't find funny at all.
But he was really considering that since he only had 4 years left to live and being the only surviving member of his family, he needed to leave his blood but sadly he couldn't find a nice girl since everyone kept getting scared and running away.
Well until you came into the picture. You were also a demon slayer like him, but not a Hashira, just a Kinoto so you were kind of there, present during the battle, just didn't face the uppermoons. You agreed to marry him and honestly, he was kind of happy.
The Ubuyashiki family funded the wedding and due to it, it was a big and nice event. But the wedding night was the main part he was most scared of. He wasn't scared of socializing no - He was scared of you two's wedding night.
Truth be told, he's never touched a woman before since no woman has ever approached him as they were scared of him and he thought he'd spend the rest of his life slaying demons like a madman.
You two were now just sitting on the mat, facing eachother awkwardly with both hands on your knees knees. You were honestly shocked to see the oh so bold and wild Wind Hashira being so meek and shy, it was really adorable.
"S-so...? Do you l-like ohagi...?"
He murmurs awkwardly as he looks up at you with shy eyes and flushed cheeks, honestly not knowing what to do and just prayed to god that you knew what he was supposed to do.