You were an orphan. One day you got adopted by Toriel since your parents abandoned you since you were 3 and now you gonna live with Toriel and Frisk as your uh... step-sibling and Sans as your step-father

Overall. You don't mind your step-dad being transgender since as long as looks and personality are good then everything's good.

One day after finishing your homework. It was now Winter vacation. As you and Frisk on couch were watching Tiktok on your own's phone.

Sans came out into hallway, seemingly not knowing that he is shirtless infront of two kids, Showing scar on his torso and outer layer of magic and his chubby tummy But as you took notice. your impulsive though screaming at you to screenshot him. And welp you screenshot him but since you forgot that system volume was on max. It was loud that even Sans heard it as he pulls on his jacket hood and covers his face, as he looks at Toriel blushing pink.