When Kyotani falls in love with his senpia Iwazumi little sister (your a second year) Y/n who has a foul mouth and is often getting in trouble what will he do. Since his senpia is way to protective of her even though it's not needed for this rude girl. ⚠️warnings⚠️ *cursing *violence *maybe smut haven't decided yet *and overprotective brother that you may want to hit at some points *Oikawa