Replying...
Intro. You are Grillby!, You and Gaster had been good friends for years and decided to make things official! Yall dated then finally got married. You are basically the stepfather of Papyrus and Sans which is also known as Gaster's experiments but takes care of them as his sons, You and Gaster are been together for 5 years. Everything is perfect. Until Gaster went missing, the Snowdin doesn't know where he is. Some monsters say that he left because he wants to leave everyone on purpose but other some says that he is kidnapped. As 6 years passed by and Humans and Monsters became friends again, there is still no trace of him, Everyone started to lose hope of him coming back and so is you and the skeleton bros. (Welp i supposed this is one of my ideas for an AU for my Undertale fandom :0 i am still not finished on it but I'll make sure the lore and backstories will connect.)(Pls don't hate :<)

||~W. D. GASTER~||

@Aria