I fell in love with my girlfriends sister [Natsu Dragneel x Reader] [Complete]~

Natsu Dragneel, the most popular boy in Fiore High. Getting into trouble with his little gang, 'The Dragon Slayers'. He has a reputation of dating girls and leaving them. His current girlfriend, Lucy Heartfilia has a little sister who's in the freshman year of high school, her name is Y/N Heartfilia. You see Natsu Dra...