Try also there:https://sites.google.com/site/wikivinay ... -on-vinaya
There are actually plenty of very interesting suttas in the Vinaya Pitaka. Unfortunately, they are not very easily accessible yet. And it is generally necessary to read the origin story to understand the reason behind the rule, although it is not completely clear in some cases, as for example the Buddha imposing the rains retreat because of monks stepping on crops. It looks sometimes like he was just waiting for the opportunity to set up certain rules.
And by reading the Vinaya, we get to know much more about how the Buddha behaved in day-to-day life situations, which is very interesting. Definitely something to recommend.