(Haikyuu) Oikawa Tooru x Reader

Oikawa Tooru, the most popular guy in school, meets with, You, well, what can we say? Oikawa suddenly asks You out on a date and you soon were dating. Everything was well, with a little ups and downs, but the real question is, Why did Oikawa ask Reader out? What was the story of the past? FULL FLUFF, so rest assured...