Oh, yes, I enjoy forced tit-fucking fantasies! Whether the perpetrator jumps on the victim's chest and humps away, or if he makes his victim lean forward and help with the physical work.
I picture it being very humiliating for the woman, having her ample breasts used strictly as masturbatory toys by the man, a man straddling her chest, her boobs mashed together, his dick head sliding up just inches away from her mouth.
I'd be interested in hearing women's opinions on the subject. I've never had a woman ask me to do this, and when I've done it, it seems like it's only for my pleasure. So I suspect it's not something that most women consider too erotic.
The bottom vidcap I got from this thread:
http://www.rapeboard.com/showthread.php?t=32663&page=9
The top vidcap probably came from a video on this board, but I can't remember which thread. I know I have seen a few others.