I had a few girlfriends who loved to do this to entice me. Especially when we were in the throes of passion it was always a major turn on. Two of them didn't have that large of an endowment but damn was it ever sexy. It's much like when they squeeze their legs together and give you that perfect view of their tightly squeezed pink bits... it's a sight to behold.
Carry on with the excellent postings please people.