The luvurbody is a bit softer than both the large and small fleurcup. As to size, the large fleucup can actually fit almost entirely inside the large luvurbody, as you can see from the pic. So I`m guessing it will take quite a bit more :)
Will let you know how it goes when once I`ve had a chance to try it out.
Cups in picture, from left to right: small Meluna, large LuvUrBody, large Fleucup and small Fleurcup.