When your reach is not much beyond that of your boobs, it becomes inevitable that they will frequently be pressing up against things. Beshine refers to them as big boob moments, saying she loves how, as her breasts have gotten bigger, they just happen more and more, and she is always excited to experience them.
Another reason to like this video is that, although cold and in public, Beshine has chosen to either go either braless or with a very stretched bra; she has her customary layers of t-shirts, however, her breasts are not tightly squeezed together, but allowed to seek a naturally wider stance, which, IMHO, always makes her look even larger, with her sideboobs jutting out the extra inches.