Slendercock has the idea. The “preparation” doesn’t have to be this mechanical procedure that kills the mood.it’s foreplay that enhances the mood. I used to do the prep work on her ass while 69ing. Like a lot of men, I’m very visually oriented so being able to watch as first one, then 2, then 3 fingers go in there turned me on. I also think there’s a Pavlovian conditioning going on for the woman where she associates having me in her ass with pleasure because I’m eating her out at the same time. By the time she has her orgasm from the oral component she’s begging me to stuff it in her ass.