"It's just a quick trip nearby, so it should be fine..." thinking this, my sister-in-law went shopping without a bra. On her way back, she was suddenly caught in a heavy downpour and got soaked from head to toe! And because she wasn't wearing a bra, her t-shirt stuck to her breasts, making her nipples clearly visible through the fabric! Even though it was through her t-shirt, seeing my sister-in-law's breasts made me instantly hard! Worse still, my erection was spotted by her, and I thought it was all over... but she seemed turned on by my erect penis and started aggressively pursuing me!
