My little sister wasn't wearing a bra, and her nipples were sticking out!? I kept looking because I was curious, and my sister's nipples got erect from embarrassment, so much that they were clearly visible through her clothes! Seeing this, I got fully hard too! My sister saw my erection and got excited, begging me "I love it when you touch my nipples," so I played with them... She was writhing in pleasure! Even more, after I kept touching her, she demanded hard-core high-speed cowgirl position and forced me to finish inside her!!
