Apparently only I don't see any hole in this blackmail, although I don't like it either. They both love each other and struggle with inner feelings. If Elyn has the opportunity to avoid incest in the tower by knocking up the ladies there, then Tristy is isolated from the world and tries to woo her sister in any way. Plus, it doesn't look like Elyn is super dominant yet. I hope that in the future she will stutter less and take more initiative, like in the night scenes with her mother and sister, but so far everything that happens to her, including Tristy's blackmail, is quite natural. She learning.And presto, no more blackmail or no more sister. That blackmail ploy is poorly contrived and a gaping wound of a plot hole that needs to be sealed ASAP. It would be much sexier if Tristy would just beg for her sister's huge, throbbing cock. THAT would be sexy! Blackmail? NOT sexy. TBH, if someone were trying to blackmail me in the same manner I would simply go to the person the blackmailer was threatening to tell, reveal the secret and let the chips fall where they may. I will not allow another person to have that kind of control over me. Sister or not, I would end her before allowing that behavior. Kid sister gets a new name... Cinder... burnt to a crisp.
All in all I think it was great and large update, totally worth waiting. All scenes was hot, but dream with Aphrodite is on another level. Hope to see that confidence in Elyn.