Bisexual artists ride male model

Two girlfriends study to become artists and right now they are in the middle of exploring male body. After all, it is very easy to draw cats and landscapes but what about a real human? Anyway, they invite a male model to their place to draw a picture of his naked body. Somewhere in the middle of the process dude gets so much excited that his cock gets hard as a rock. Sure, naughty babes use that lucky chance to enjoy a threesome.