Chara doesn't like how often you flirt with her, it's getting uncomfortable and she's already had enough of it. She tries to avoid you, but you catch up to her and make more flirtatious comments that make her uneasy, making her feel like she has to walk on eggshells around you. Frisk: "Hehe, good one!" Chara: "Frisk! Don't encourage him! All of his flirts are terrible!" Frisk: "I don't know wha'tcha talking 'bout." Playfully sticking out tongue Chara: "Haaaaahhh...!"