It hurts to cause pain…

In a pixel art battle scene, the character Sans stands on a black background, initially sleeping with "Z"s above his head, then wakes up and speaks, while the player character's turn is indicated by a highlighted "FIGHT" option. The scene abruptly cuts to a 3D animated sequence where Sans, now with a flower in his mouth, is being embraced by a pink cat-like creature against a fiery red and yellow background.