Ich kam in den mund meiner stiefschwester, während sie fern sah

She was lying across my lap while we watched TV, her head resting against me like nothing was out of the ordinary. I was already half hard, and she must have noticed, because she shifted and “accidentally” brushed against me. Then she said she'd help me scratch an itch… and her hand slid over my cock. One stroke turned into two, and before we knew it she was leaning down and taking me in her mouth. I couldn't hold back—when I came, it was right in her mouth, and she swallowed with a sly little smile like it was exactly what she wanted all along.