Girls just shy away from sucking at first. Once they give a blowjob, all their embarrassment disappears. They begin to work on the technique of moving the hands, taking the cheek, dipping deeper and deeper into the throat. If the cock is not too long, they try to take it all in their mouth, to get their nose against the man's pubis. A little alcohol and she can already suck your friend's dick. It's a nice feeling when you mold a modest girl into a real bitch. Now for her to take cum in her mouth and swallow it becomes the norm. Gradually you get to her ass. After that, she no longer cringes if you treat her in bed as an available woman. It even turns her on.
Girls got excited while riding stallions, so it's not surprising that when they saw those guys they jumped on them. Well, their chosen pose is exactly what I pointed out in the previous sentence. It has always been a mystery why so many girls love horses, actually this video partially answers this question.
Holy shit, I want one too.