Serena arrives

Serena, hey cuz," Yuzu said as she let her cousin in.

Yuya took one look and could understand how people could confuse them for sisters. Her face looked just like Yuzu's, however her eyes were green instead of blue and indigo hair tied in a ponytail with a large yellow ribbon. She wore a red jacket, a broad grey skirt, a black vest that is half unzipped over a white shirt and large black and red boots.

"So this is the kid you need help with?" Serena asked. "Doesn't look like much. You need all our help?"

"Well, first time babysitting so I figured a few extra hands would be good."

"You know when it comes to babysitting I'm not the person to go to."

After some talk and introduced herself as Serena Tsukineko, Yuzu managed to talk Serena into letting Yuya hypnotize her. Once he finished and had Serena under his thumb too, the doorbell rang as Yuya went to open it and found what?