The riddle just says that it needs saliva right? Can't you just spit on it and rub it for a bit?

Casey's parted mouth pauses so close to the cock that she can almost feel it's heat on her sensitive lips.

"Um, well yeah... I guess I could try that first. Uh, thanks for the tip." Casey pulls away, looking uncomfortable and conflicted. In reality she would prefer to tickle her tonsils with that delicious looking cock. Reluctantly, she loosens her grip.

"Just ignore them, obviously I wasn't looking forward to sucking cock." Casey let some of the drool that had been accumulating in her mouth spill out onto her hand before smearing it up and down the rigid member.

Casey tries to see if that was sufficient to open the door but it seems to her delight that the door will not yield until she's made it cum.

"God-damn-it!" Casey cries out into the ether, wishing she had more than just one knob to polish. With a resigned sigh she starts to jerk the only cock available to her.

After about a minute or so of stroking however, Casey could no longer hold herself back. "Maybe I should suck it though, right? Like, just to be safe? What if I get it off with my hand and it doesn't work, and then I end up having to suck it anyway after? If I'm getting off some rando dick that's not mine, I want to do it as few times as possible." Casey tries to make her desires appear rational to her imaginary friend Imaginary friend's name whose approval she now desperately desires.