Sanemi Shinazugawa- Math teacher.
Y/n L/n - Science teacher and a Nurse in the clinic.
Kimetsu no yaiba characters are not mine all credits for the rightful owner, All images, videos, I used for this fanfiction aren't mine all credits to the rightfu...
Y/n is observing Sanemi whenever she got a chance, and she love to tease him a lot. She spots that Sanemi is always serious. He rarely smile and really strict on one point, he always swear and shout on anyone, even his little brother have no exception from it.
He even insults you, but you always think that if he insulting you, he add a compliment along.
Y/n end up missing the adorable side of him and couldn't help but chat with Genya who have seen his Older brother act adorable.
And share some of the memories, which most likely, blurry to Genya but y/n have tell Genya the embarrassing stunts that sanemi did to his Little brother. When they were still young. Only Sanemi, Genya and her know.
Y/n POV
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"Do you know, the two of you used to play beetles, You always look amaze from it and Sa-chan were full of dirt, cause he tried his best to catch one for you, since he said he wanted to be a Good Older brother to you" I said to Genya who just blush at me.
We happily chat together, and our main topic is Sa-chan a. K. a Sanemi, his Older brother.
"Really, Nii-chan said that? Actually I'm scared of him" Genya said.
"Eh? Why?" I asked and I was full of questions and then he tell me.
"... I was in a club in Archery, Nee-chan, I once joined the competition, it was my first time, and I was happy at my first time, I won"
" That's great, congratulations to you, Genya" I said and pat his head and he blushed and continue.
"After winning, I didn't notice Nii-chan, he climb on the stage and rip the certificate I should have infront of me and said instead of wasting my time, I should focus more on math" Genya said.
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" Eh! for real...Sa-chan, did that? but he was really adorable, before, I can't believe it" I said when Genya cover his face.
" I don't know too, how Sanemi-niichan become like that, y/n-neechan" Genya said and tell me, what he said to Genya when he call him Nii-chan in school " I don't have an Idiot brother who can't do math" he said when Genya just simply want to greet him in school.
