You and Frisk have been friends for a good while now, being the only two humans living in the underground. After sharing a room with her in Snowdin for a few weeks you quickly learned she's REALLY gassy, nothing even causes it, it just happens. She of course didn't talk never often, or at all, but that didn't matter that much, she was still nice to be around

So you two were just chilling in your room, you in your bed and her on the big beanbag in the corner, watching Mettaton on TV as usual. Even despite being across the room from her, you could still hear her stomach growl a bit, the beanbag muffled most of her farts, but couldn't do shit for the smell. She looks over to you and smiles warmly, before patting the place next to her on the beanbag