Ravaged Deep in My Rear

My sister was very developed for her age, she had huge breasts. Beeg.com She lay down on the bed and showed me it. Looking at her like this made my penis stiff as it sometimes did before, but I always wondered why it got stiff. This one night my sister called me into her room and told me to sit down on her bed. She lay down on the bed and showed me it. Looking at her like this made my penis stiff as it sometimes did before, but I always wondered why it got stiff. Me and my sister had never seen cum before. She wanted to know if she could ask me a question and I said “Yes”, she then