Imagine you are swimming. And baby shark comes out of nowhere, and sinks his fucking teeth into your ball sacks. This is what it feels like when they bite nipple. Like they have declared war. Like, if you have a hammer in your hand, you could bash the brains out of this little shit. This is what it feels like.
Kev is so upset that V won't try harder. But when Svetlana explains it in the explicit language above, he starts to understand just how painful breastfeeding can be.