What if Issei had an older brother that's gone missing for most of Issei's life? Where has he been and what has he been doing all this time?

(Y/N) is a half demon. Her mother was turned into a demon while pregnant and still miraculously gave birth to (Y/N). As a half demon she can withstand the sunlight and her demon strength gets stronger in the night. Will the demon slayers accept her though? Just a small giyuu x reader since I'm in quarantine and v bored. Lowkey a shitty description that doesn't describe the book well now that I reread it but just read and y'all will find out lmao Copy right: I do not own demon slayer or any of the characters

╰⋯➤ 𝐕𝐀𝐑𝐈𝐎𝐔𝐒 𝐊𝐍𝐘 𝐗 𝐅𝐄𝐌𝐀𝐋𝐄 𝐑𝐄𝐀𝐃𝐄𝐑 ― A human with the intent of killing other humans: that was something the Demon Slayer Corps never had to deal with. A human with no morals, empathy, or emotions: a human perfect as a demon. ― VARIOUS KNY / DEMON SLAYER X FEMALE READER 𝐖𝐀𝐑𝐍𝐈𝐍𝐆: minor swearing, themes of gore, obsessive behavior, manipulative behavior, dark themes Kimetsu no Yaiba/Demon Slayer is owned by Koyoharu Gotouge. Art in the cover (depending on my current profile theme), if displaying Ubuyashiki Kiriya [matching the headers], is by @/DonBrocas on ZEDGE. First published: Wednesday, August 12, 2020. Completed on: Thursday, January 28, 2021. 1M views reached Friday, June 3, 2021, with the 1M special posted the following day. Highest rankings: #1 in kny | #1 in kimetsunoyaiba | #1 in douma #1 in giyuu | #1 in tengen | #1 in readerxvarious #2 in readerinsert | #1 in zenitsu | #1 in muzan #1 in tanjiro | #2 in yandere | #1 in knyxreader #1 in kimetsunoyaibaxreader | #1 in shinobu #1 in demonslayerxreader | #1 in demonslayer

After Zeus The Lighting God died the Gods only had only one thing to do and that was take Zeus's soul and Reincarnate him into an new baby and that baby was Y/n. Y/n grew up with Nothing but One day he met Rias that day an that changed his whole life but it was not what he seems. Also I don't own any art that I use or Highschool DxD