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It was Klaus and Stefan that formed a romantic relationship in the 20s
When the bar was raided Klaus didn't compel Stefan to forget but brought him with them
Klaus becomes basically a supernatural mob boss
After they lost New Orleans he wanted another kingdom to run so he made a new one. Just more spread out. He's running businesses both legal and not. Supernatural and human. He's got people owing him favors, connections with witches, information networks, etc.
Stefan becomes Klaus' pet ripper/lover/sugar baby
Stefan knows how to toe the line and get away with things Klaus killed others for
Stefan and Klaus rescue Damon and Enzo unintentionally
Eventual Damon/Enzo pairing
Being a Ripper is genetic in the same way addiction is genetic