(3rd Person)
Tanjiro and (Y/N) stared with confused but intrigued stares at the blonde-haired male clutching onto the girl... well, Tanjiro was confused while (Y/N) was simply huffing through his nose as he easily recognised the boy from Final Selection. While the boy's sparrow flew over to Tanjirou's outstretched palm, (Y/N) walked up to the scene.
Zenitsu: Please! I don't know how much longer I'm going to live! So please make me happy and marry me! It-
He was cut off by someone quickly pulling on the back of his haori, pulling him off the girl. Zenitsu blinked in surprise and looked back, going wide-eyed as he recognised the troubled face of (Y/N).
(Y/N): Hey, come on now, the only person we should give trouble to are demons, you shouldn't...
Zenitsu: It's you, you bastard!!!
Everyone jumped once again from Zenitsu's loud voice as he suddenly grasped (Y/N)'s shoulders, glaring straight into his soul while (Y/N) back off, unsure of how to handle the sudden change in his demeanour while he was being shaken by the blonde.
Zenitsu: You left me behind to go have fun with that girl from the Final Selection! I hope it was worth it! Because in this life, you'll be lucky to even meet a girl before you're devoured by a demon! You should've been protecting me during the Final Selection but you went to make out with that cute girl with the butterfly pin! How dare you!!!
(Y/N): No... but... well... you're alive... so that means you were fine...
Zenitsu: I was terrified! I almost died a total number of fifty-seven times! I passed out thirty-two times and I lost five nights of sleep! All because you went off and had fun with that girl while everyone else was fighting the demons! Repent! Repent for your carlessness of other people!
Before (Y/N) could respond, Zenitsu was pulled off again, this time by Tanjiro who was giving Zenitsu a rather harsh glare while holding onto his haori just as (Y/N) did earlier.
Tanjiro: Would you stop bothering people!? And stop causing trouble for your sparrow!
Zenitsu: T-that uniform! You were also at the Final Selection!
Tanjiro: I don't know anyone like you!
As they continued to argue about Tanjiro's memory, (Y/N) sighed silently before looking over at the rather befuddled girl. He let out a small smile of reassurance.
(Y/N): I'm sorry for the trouble my colleague has caused you, you're free to head on home if you wish.
Girl: I will, thank you both for the help.
Zenitsu: Hey!!
Another moment of yelling from Zenitsu caused the two to jump as Zenitsu suddenly appeared behind (Y/N), his face hysterical with tears brimming at the corner of his eyes while a small trail of snot was slowly appearing.
Zenitsu: Stop getting in the way! That girl wants to marry me! We'll be happy together before I...
Another interruption, this time in the form of a slap as the girl slapped Zenitsu's soul right out of his body, in fact the slap was so powerful that it sent the demon slayer spinning while the small trails of snot and tears shot out of his eyes and nose from the pressure. (Y/N) blinked with wide eyes in surprise as he watched the ranting boy turn into a snivelling mess, covering his head up while the girl continued to punish him for his loud and rude actions.
It was quickly stopped when Tanjiro decided to intervene; grabbing the girl's shoulders, he pulled her back and out of range so that her slaps weren't able to damage Zenitsu who continued to cry out from the pain he felt. (Y/N) just decided to watch the debacle as the girl grew an angry expression while pointing at Zenitsu.

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The Fourth Option (Kimetsu No Yaiba x Male Reader Volume 1)
FanfictionWhen it came to demons, one boy knew exactly how they could be when cornering humans. He was sure of his death at that moment... until a kind soul came along and saved him from the inevitable death. Once he was saved, the boy knew this kind of incid...