I was awake and stroking my morning wood when my sister knocked on my door. She usually sleeps in till at least 10. “Can I come in?” She asked when I answered. “Yea sure.” Ella was kind of a friend as well as my little sister and we got along well. “Happy Birthday Sweetie!!” I sat up opening my arms in welcome. Her pretty face and big smile brightened right up. She took a few quick steps to cross the room to jump into my bed. She was instantly giggling and struggling in my arms as I tickled her saying good morning and wondering if she was to excited to sleep the day away. She would officially be 12 years old at 11:05 this morning. I’m pretty sure that we noticed at the same time my naked erection sticking up between her bare, slender thighs. I had become mostly uncovered as we horsed around. We stared for a moment then we looked at each other. Her pretty blue eyes were hugely open with excited surprise. “Well! um Happy Birthday Again!!!” She looked again, back at me, and busted out laughing. I could feel my blush like a quick moving fire cover my face. Laughing she rolled off my lap and scooched around to face me as I tugged on the sheets. “OH NOnononoLet me see!! Let me see it! Oh Pleasepleaseplease Let me see it Please!!” She was pulling on the sheets herself but trying to pull them away not on, like I was. I thought quickly, putting up a half hearted struggle, and let her reveal my 16 year old b****. “OH- MY- GOD!!” She looked into my eyes. “This is sooo coool can I feel it!?” Barely holding her eager hand back.