While I was taking a shower, my sister said, 'Let's take one together sometime! Hehehe,' so I thought she was joking and said, 'Sure.' But then, my naked sister really came into the bathroom... 'I'll wash your back for you.' My sister suddenly appeared in full nudity offering a body wash service! My brother couldn't hide his erection and was noticed by his sister. Seeing her brother's robust penis, my sister...!?
