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.
An affectionate pussycat is nice too, especially when she has such beautiful breasts. Of course I would like to have a better body, but it's not bad either! One thing I do not understand - why do you need a piercing on the labia?