"Ouch!" Karina winced after I slapped her too hard. She gritted at me and touched her swollen cheek that I smacked. My cheeks were twinging because of what she had done to my cheeks.
"s**t! Your slap is too painful. Are you trying to ruin my gorgeous face?" Karina angrily asked me, which made me laugh at her. She groaned and gave me a death glare.
"It's you who suggested this way! After all, you may be my sister, but it doesn't mean that I can easily forget how you badly treated me!" I smirked at her.
After Karina found out that we were both sisters, she felt guilty for being a b***h toward me. She suggested that we slap each other several times to be quiet about what we had done to each other. Karina took a deep breath as if she was calming her nerves to be a b***h to me.
"I still ca
