My childhood friend, who I'd been playing with casually since we were little, grew into a beautiful woman as time passed. When she was sleeping defenselessly, I got aroused and masturbated to her. But she woke up and the atmosphere became awkward. Then, with an awkward look on her face, she said, "We're childhood friends, so we're like siblings. I can't put it in, but it's okay if you just do it somewhere..."!!