"Wo-wow, who would've guessed that guy has such a pretty little sister. (said in monotone)"
"Eh?"
"Ehehe..."
"Don't tease me, I'm not pretty at all."
"Stop acting so bashful! I'm only trying to be considerate!"
"I feel kinda relaxed talking to you, big brother."
"Do you have a girlfriend?"
"This guy...He's gotten carried away just because he thinks I didn't know..."