Back in the late 1970s, I started punting by visiting King's Cross Sauna for a massage and topless relief. On my third visit, as I fondled my masseuse's large breasts, her nipples hardened noticeably in a way that I've never encountered before or after. It only occurred to me fairly recently that she must have been very frustrated at the end of her shift after many blokes had groped her tits - if she had a boyfriend, he would have been commanded to shag her immediately.
Anyway, I have since been pursuing something of a holy grail: where to find a girl with large firm breasts tipped with sensitive nipples that swell and could poke your eye out.