I'm dating the younger sister of a pair of childhood friends. One day, when I went to her house, her older sister 'Konan' was clinging to me in a no-bra outfit! I hadn't noticed, but it turns out she has huge breasts. Her nipples were poking through her bra-less camisole, and a bit of her areola was visible, which was so erotic that I couldn't hold back my erection! 'Don't you think my boobs are better?' Unable to resist her H-cup aggressive promotion, I secretly groped her breasts, enjoying their fullness, and ended up crossing the line.
