Gaster x Reader

Pretty self explanatory. This takes place after the Pacifist route in Undertale. Through determination, Frisk was able to bring back Chara, Asriel (Asriel is Flowey per say), and Gaster. I believe that Gaster is the father of Sans and Papyrus. I also don't believe that Chara is evil. The monsters are on the surface, a...

𝙵𝚊𝚖𝚒𝚕𝚢

(Y/n) was Eri's younger sister,a quite girl,Eri was (Y/n) older sister,a girl who really never spoke. Kota was a small boy,and was really quite. Mahoro was Katsuma's older sister,a shy boy. Kastuma was Mahoro's little brother,an overprotective sister. But what if all that changes when everyone's parents either die or...