My darling ~ A Yandere Underfell Mettaton X Reader Story [Complete]
[2nd book] A Yandere Underfell Mettaton x reader story After Y/n falls down, they meet someone to help them throughout their way back home. Somehow they become very good friends, untill a robot ( (not so) superstar) comes in the way and falls in love. This love drives him insane into an obsession. "W-What do you want...