My sister loves me so much and treats me so innocently, she's my perfect type! One day, while I was taking a bath, she came in and said she'd wash my back! Her budding breasts were completely visible, and our skin rubbed against each other... I couldn't help but get an erection, and of course she found out. I thought it was dangerous, but then she said, "I'll do anything to make you happy," and it turned out to be a godlike development! She also said, "My nipples are really sensitive," so I played with her nipples, and she arched her back and had multiple orgasms!