do you remember the combination? i think i tried almost everything, the walktrhough didn't help in this, it say you have to touch her ass in low arousal, but the scene end if you do that
Basically, go from Jessica's least to most erogenous zones (from kissing her lips to playing with her pussy). I believe in this scene there's two pussy options--one while she's on her back and one while on hands and knees. You can play with her butt at any time during this first warmup (just to spread it). Then, once you've hit every area of her body, go back and do the same thing over again in the same order (from kissing to pussy) and then play with her butt last. This time you playing with her butt should finger her asshole and Jessica should respond with something like "You men are always trying to put things in my ass" or something like that.
If you get "Woah! Not ready for that" then use the mouse wheel to scroll up and undo your attempt to finger her ass, because you haven't warmed her up enough. Also undo your action if you ever see it say, "She enjoys this, but it's not getting her any closer", or something like that, because that means you're wasting an action to do something that's not turning her on any more.
As long as you've fingered her ass by the time you start having sex with her, you'll be able to select "Change positions" and "Fuck her ass" during the sex scene.