My sister, who has a brother complex, decides to find out her brother's sexual preferences so that she can have sex with him! That's when I discovered his gym shorts! My sister changed into her gym shorts right in front of me! I lost all sense of reason and started rubbing her gym shorts! I loved her so much! It felt so good to have my erect penis in my sister's mouth! I moved her gym shorts aside and inserted it into my sister's pussy! It felt so good! Gym shorts are the best!