At first, I just happened to peek… but my sister’s soft-looking breasts, soft peach buttocks, and tight waist… I was tingling at my sister’s body, which had matured during puberty, and before I knew it, I had an erection. I was so fascinated by peeking into her bath that I thought I couldn’t do it. One day, our eyes met… “I knew you were always watching me, big brother.” Her devilish side triggered my sexual desire switch, and I was excited by her moist, wet hair, the faint smell of shampoo, and her sweaty skin in the summer! Enveloped by a sense of immorality… I licked all over her lewd body that I was peeking into, and we intermingled in a moist, sweaty state as if we were devouring it… Our bodies were so compatible that when my sister let me peek into her bath, it became a signal for forbidden sex…