Fred/Helena and whoever else is good people!
"I'm terrified, really," he drawled, doing a fairly good impression of Malfoy. To be honest, he was actually quite happy about having Ginny here. She was fine example of how girls in his time were, not that he necessarily wanted Helena to be like her. He caught the look on Helena's face and smiled a bit, which quickly became him biting his lip to hold back a laugh when Helena said his sister was terrifying.
"Oh, look, Gin. Harry's here. We should go wish him a happy birthday," he said with a grin. He lightly touched Helena's elbow to lead her across the room, waving goodbye to Ginny with a winning grin. He stopped for a moment to wish Harry a happy birthday as they was passing before stopping across the room. "I'm so sorry about that."