My Alpha Brother is my Mate

Chapter 1

Alphas Duncan Preston POV

"Come with me into the shower," she said, wrapping her small fingers tightly around my wrist and tugging gently.

She stuck out her lower lip in that classic pout she'd used since she was little, looking up at me with big, pleading eyes like a kid begging for one more cookie before bed.

I shook my head firmly and pulled my arm back just enough to break her grip. "I'm sorry, but I can't do that," I told her, keeping my voice steady even though my pulse was already starting to race.

Her brows scrunched together in confusion, and a flash of hurt crossed her face. "Why not?" she asked, sounding genuinely puzzled, almost offended.

I cleared my throat and deliberately looked away from her, staring at the tiled wall instead of her face. "Because you're not a little girl anymore," I said quietly, the words tasting heavy on my tongue.

She crossed her arms over her chest, pushing her shoulders back a little. "But I've seen you in the shower with that girl before!" she shot back, her voice cracking with a mix of jealousy and confusion.

"She was a total stranger to you, some random woman, and you didn't have any problem with her. But I'm your sister. Please?" She tilted her head and gave me those wide, puppy-dog eyes that used to work every time she wanted something when we were kids.

I felt my resolve crack almost instantly. I couldn't stand seeing her look so disappointed, so hurt. After a long second of internal battle, I let out a defeated breath. "Alright," I muttered. "Fine."

The second we stepped into the steamy shower room, she didn't hesitate.

In one quick, fluid motion, she peeled off every single piece of clothing she had on-shirt, shorts, underwear-and dropped them in a careless pile on the wet floor. I froze.

My mouth went completely dry. The body standing in front of me wasn't the skinny little kid I still pictured in my head. This was the body of a grown woman, curves in places that hadn't been there before, smooth skin glowing under the warm spray, full breasts, rounded hips, long legs. I swallowed hard, trying to force my eyes anywhere else, but they kept dragging back.

My tongue betrayed me before I could stop it. "Oh my God," I breathed out without thinking. "I thought your body was still... " You know... like a young girl's, but-" I cut myself off, taking a deep, shaky breath to try to pull myself together. My heart was hammering against my ribs.

She spun around to face me fully, water already running in little rivers down her skin. "What do you mean?" she asked innocently, tilting her head. Then, without any embarrassment at all, she pointed to her chest. "My breasts are growing now-see?" She cupped them lightly for emphasis, like she was showing me a science project.

Before I could respond, she turned sideways