OP only said "Breast Worship" so this would suggest he's interested in all sizes of chebs/knockers/jugs etc rather than just gazungas (though realistically you can't really worship a pair of A cups).
In my bitter experience, booking an SP with huge gazungas isn't all that. You're just confronted with two huge meat sacks that lack density. I've had a lot more fun with the mid range funbags shown, which is probably my upper limit.
Another is that she has to be down with you spending time on them, some SPs know what you're there for but just think allowing "access" during sex or as brief foreplay is sufficient. Given many just want to lay back and have you finish, standing there and having you motorboat isn't on their agenda.
With some SPs I've been quite upfront about my reasons for booking and expectations and had this confirmed beforehand.
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