I enjoyed the subtlety with which Lapis let Diana know that Natori is hers, just the perfect degree of pettiness and veiled threat that is so fitting for a ruthless villainess like Lapis. Very curious about what Gran is planning, he seems to be aware of Lapis' plans and I'm guessing that is what he revealed to Rubeus and if they are planning to use Lapis' newfound affection for Natori and Diana's crush as a way to stop Lapis' plans.
Since Diana's crush is being framed as something "darker" I wonder if her character arc will be about learning to deal with those feelings and ultimately give up on Natori.
Also, my headcanon is that Lapis and Natori did more than sleep that night.