Heh, well I didn't expect Chisaki to just roll over and accept the possibility of Ueno dating Moka. If they do date, Chisaki will face the difficult decision on letting her only
toy be shelved for the foreseeable future or trying to get Ueno to cheat on Moka so Chisaki can get her rocks off which I can't see Chisaki doing that to Moka unless she becomes sexually frustrated. Besides, beneath her twisted perversion, Chisaki does have romantic feelings for Ueno. She just doesn't realize it yet.
Also, for Ueno, it would be wise for him to tell the truth before he starts dating Moka. He can be vague about the details of his programming because he respects the friendship between the bullies and Moka enough not to destroy it by revealing the whole truth. If he doesn't, a possible Ueno-Moka relationship might crumble due to intimacy incompatibility or trust issues( which I think might happen since Moka's ex was a serial cheater). A little transparency will give Ueno some leniency from an understanding Moka and will lessen the impact if Chisaki decides to go scorched earth with the blackmail material.
Plus it will go a long way in breaking Ueno's programming.