"Oh, I see how it is. You just want an excuse to beat up some poor boy," Lavender goaded, poking Seamus in the ribs.
Lavender squeezed Seamus back, tightening the hug, partially due to her happiness with him and partially because of the increasing cold. "I will look forward to being old and grumpy with you, my friend."
Giving Seamus another tickle in the stomach, she said, "Honestly, you don't have to thank me. I couldn't think of anything that could make Christmas any better than having you here." With a final squeeze, she disentangled herself from his embrace and felt the chill almost immediately, "We should head back and Floo your mum before it gets too late." Scanning the perimeter and ensuring that it was clear, she tapped her wand against the picnic basket and everything flew into it, and another tap made it small enough to fit in her pocket. Because the cold was unbearable - and surely, this was the only reason? - Lavender put her arms around Seamus's waist again and stole his body warmth for the walk home.