Specifically, her estrus requires yang energy to satiate, and it's hinted that she'll weaken considerably if she doesn't fulfill her needs. So, does she search for a way to suppress her weakness in the short term? Maybe create a spell formation that extracts yang energy from a massive population, or find a material that provides yang instead?

Nope. Let's go seduce a sword practitioner who's as powerful as her (pre-weakness) -- what could go wrong?

Is the 'system' it's just the BBEG ROB that initially killed her by stabbing 72 times and then isekaid her into p*rn land to try to force her to be r*ped horribly for the awful crime of writing smut. All she does is mock the MC and do everything in her power to f*ck her over. She can also somehow communicate with other characters to ruin the mc's plans. If you can stand a Judas sitting inside the mc's brain constantly betraying them while they're completely unaware Then this novel would prob be a 4.5/5 for me. But because it's incredibly annoying to me I've knocked it down to 3 stars.