A Bullet to the Heart (Sinon x Reader)

(Y/n) (L/n) and his younger sister Nanami (L/n) both are regular ALO players but (Y/n) soon decided to play a different game and he went with Gun Gale Online(GGO) but little does he know a surprise waits in that world. I do not own SAO if I did well that be cool but I'm not soooooooooooooooooooooooo I also do not own...