Undertale & Deltarune Oneshots

☆Let Me Help You- Gaster & Sans

Plot: When Gaster gets a call from Grillby saying that Sans needs some help, he learns a lot about this relationship Sans is in, and he definitely doesn't like it

Requested By: Dingdongthewitchisde

Extra info: Sans is 21, but still lives with Gaster, Grillby is 22, Sans "boyfriend", Jason, is 22, and Papyrus is 16. I'm making this a small AU where they live on the surface so some of what I want to add makes more sense

⚠️TW: Abuse and characters being drunk⚠️

~☆~

Gaster quickly sits up, startled awake by the sound of his phone ringing. He was working late in the lab behind his house after Papyrus went to bed and he fell asleep by accident, but he definitely wasn't expecting this to be the way he woke up.

He checked the caller ID, it was Grillby. This sent a small wave of anxiety through Gaster. He knew Grillby was with Sans, so if either of them needed something Sans would've been the one to give him a call. If Grillby was calling him while he was with Sans, something was definitely wrong.

He quickly picked up the phone. "Hello, Grillby, how can I-" he was quickly interrupted by Grillby's panicked voice.

"Gaster, we need your help. Can you come pick up Sans and I? I promise I'll explain everything when you get here," Grillby quickly said, his voice shakey and full of worry.

Gaster quickly stood up, rushing inside to grab his jacket and car keys, "of course, I'll be right there. Is Sans alright?"

"W-well, he's not going to drop dead if that's what you're worried about. He'll be fine until you get here, it's better to see for yourself," he said, his voice muffled as he sounded like he was talking to someone else when he moved the phone away from his face.

"Right, where are you?" Gaster asked.

"About a mile from Sans's boyfriends house, near the old playground."

"Alright, give me a moment and I'll be there soon. Don't go anywhere and make sure you keep an eye on Sans," Gaster said, and one Grillby agreed he hung up.

Gaster made quick work to get what he needed before rushing up the stairs to Papyrus's room, he gently opened the door and walked over to his youngest son, waking him up for just a moment.

Papyrus's eyes slowly opened and he looked at his father with a sleepy expression. "Dad?"

"Sorry for waking you, Papyrus, but I need to go pick up Sans and Grillby. I'll be right back, okay?" Papyrus nodded and Gaster quickly left, rushing out to his car and driving off to the playground.

~☆~

Grillby sighed as he held Sans close, rubbing the skeletons back as he cried. The poor boy was covered in bruises with bleeding cuts on his head, which Grillby did have to take an already ripped piece of Sans's shirt to hold on top of as many of cuts as he could and wiping away the blood from the rest when needed.

He was absolutely horrified by what had happened, but now it made sense why Sans invited him to come along to this small get together with Sans and his boyfriend. Still, he had never expected it nor had he ever thought Sans would hide something like that from him.