I was lounging around at home when my sister started exercising next door! If I kept being lazy, she told me to help her with her muscle training! My sister's breasts were right in front of me! As my hand touched her pectorals, it naturally began to knead her breasts, and my sister's reactions were sensitive! Feeling her pectorals and oral muscles, finally her vaginal muscles clenched, causing my dick to explode.
