To me it looks like this babe is having a spot of trouble trying to put this swimsuit on. From what I can make out it is one of those linked-in-the-middle sort of bikinis that is not really a bikini because it has the midriff section joining the bottom to the top.
From the look on her face at this stage she is about to give up trying to put it on and is saying to her boyfriend “shall I just leave it off?” . . . and we all know what his answer to that is going to be!
For those that have no idea what I mean by a linked bikini I offer the following example. So basically this is a bikini with some material joining the top and the bottom that goes up her belly.