While I was maining a different household, Sam & Aomi got into romantic shenanigans on their own, so when I took over Sam, his romantic interest with Aomi was high, Sam wanted to marry & woohoo Aomi lol. So I fulfilled his wish, when Aomi was invited to move in, Aomi wanted the same as Sam.
The milestones they wanted were completed. Next thing I knew (to test the new awesome update) a babbu was on the way.
Sam & Aomi are like an ode to Ami & Eisam from Sims3 or Maser & Ao from Sims2.