I would expect that at one point, Louise would be kicking Saito's ass for something like asking Tabitha a question about the calender of their world (however it works), when Saito, in total pain, which in a bullet time like fashion, grab the whip before she hits him and elbows her in the chest. OF course, she would be pissed because he laid a hand on her, but he would be so angry, he would be prepared to fight back, either with his fists or his sword's sheath to avoid either of them dying. They fight for a bit, with a few amusing actions like Saito giving her a titty twister. Then, as they stand facing each other panting, they immediately throw their weapons to the ground, start making out, and then have sex, relieving those two of the extreme amount of sexual tension between them.
Although this is unlikely, I WOULD like Saito to stand up to that bitch