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.
Nothing foretold: after gently shoving a finger up her anus, to fuck her so that the walls were shaking! It's amazing how her mouth was able to accommodate his cock.