Bent over her four-legged ally getting fucked by a first-timer

I suddenly feel quite concupiscent and advise having sex with her. She accepts my tongue and spreads her legs wide for me. I enthusiastically start tongueing her cum-hole, giving her the happiness this sweetheart so well deserves. Then, before she straddles me like a fucking cowgirl, that chick gives me oral-stimulation sex.