Just wanna make sure, what exactly in this is from The Sims?

Unbreakable said:

Just wanna make sure, what exactly in this is from The Sims?

Basically, a very horny kusotori made sims of both her and Calli, and made them started dating. Aaaaand you know the rest.
It's not really apparent in the picture itself, but artist commentary should be enough to prove that.

and a subsequent tweet from that kusotori showing the bottom left graph