Indeed, Zookie, it is a wonderful problem to have. He bends in to kiss her quite a few times during the video; not sure that their lips actually touched facing each other with her boobs pressing against his chest, but you can see it is easier when Allegra stands sideward and turns her head, her boob then out of the way.
I think Foxy has inspired Allegra to go bigger, but not in a boob race; Allegra wants to display a certain Jessica Rabbit look, where I would suggest a year ago that Foxy wanted that when she had 6000 cc as a goal, now she has moved the goal posts way back. Evidently her 10K expanders are not going to be big enough and she already has bigger plans and I believe in a recent article, she said something to the effect she doesn't ever want to stop making her boobs bigger unless she develops a problem. Boobie greed is wonderful.