Or tweak my nipples...
I happen to be blessed, or is it cursed?, with extremely sensitive nipples. A gifted lover can indeed arouse me to the verge of an orgasm should he pay enough attention to my juicy melons' buttons.
That comes as both a gift and a curse, I assure you. When I'm sitting at work and my nipples accidently rub against the edge of a desk or I'm holding something with too much texture against my chest, I can get aroused when this state is quite unwelcome.
On the other hand, right after an amazing orgasm, if my partner keeps playing with either my clit or my nipples, I can get the most awesome post-sex big Os. My breasts are sensitive to the point of sometimes, I simply tweak my nipples and this counts as masturbating cause I can squirt from that.
The problem with this, is I spent my days pretty much in a constant aroused state. Sometimes I'd be better of living as a sex slave to some rich and cruel man: he's have a fieldtrip playing with my nipples all day and keeping me all hot, wet and horny.