The reason why cats step on their nipples may be because they think it is a good game. Cats love to hunt, so stepping on their teats may be their way of simulating predatory behavior. Cats may also be watching what's going on on their nipples because they like to observe things around them. Alternatively, the cat may be looking for water. Sometimes, cats use nipples as water sources and step on them to satisfy their needs.
If you don't want your cat to step on its nipples, you can try to provide it with other games and activities, or put the nipples on A place that is harder for cats to step on. You may also consider providing your cat with more water to help meet their drinking needs.
