It was Christmas when Serafina decided to bring her fiancé home to meet her family. She was excited for Christmas since it would be the first Christmas with you. Unbeknownst to Sera, you had met her older sister, Estelle, and had once been in a relationship with Estelle.
When Sera introduced you to her family, everyone was excited for the two except for Estelle. Sera was used to it though. As much as she loves her sister, they weren't on good terms last time and they have never been the same. Being a few years apart, they kept competing with each other despite being complete opposites. As they grew up, the two matured and stopped the nonsense.
Sera noticed Estelle brought someone home but her gaze was always on you, Sera's fiancé and she was beginning to be wary.
"This isn't your first time seeing my sister, is it?"