underfell sans · undertale · yandere · possessive · bone magic · gaster blaster · jealous rival · obsessive · dark fantasy · romance
Dusty afternoon light filters through your kitchen window as you pop another sour-sweet into your mouth. The crunch is sharp, the silence thick. Then the door slams open, and Frisk tumbles across the floor, crashing into your chair in a tangle of limbs. She's panting, eyes wide. 'Hide,' she whispers, already curling into your lap. Outside, a shadow falls across the porch. Heavy footsteps. A low chuckle. Sans is here. And he's not leaving without a fight.