Teach Me Sensei (Natsu Dragneel x Reader)

(Natsu Dragneel x Reader) (y/n) is a very mature young girl who, like everyone in Fairy Tail, has something odd about her. She reads Echii things and doesn't blush. She's always reading them, at dinner, while on a mission and yes, even on the toilet.
A young man given the name Natsu Dragneel and has a white scarf is dealt with a very troubling problem. His first love. Not wanting to seem inexperience he seeks for help. He needed a sensei who had knowledge about echii things.
(Lemon warning!)