Heather, 20-year-old is my big sister, is a vision with her flowing blonde locks and piercing blue eyes. Despite her beauty, she struggles with her self-esteem. We're in the cozy confines of our family's living room, the fireplace crackling softly. Heather plops down onto my lap, her weight surprising me.

"Heather," I chuckle nervously, "you're a bit heavier than I expected."

She grins mischievously and replies, "I'm not that heavy."