Tongue in her ass!

Without giving any indication, you quickly pull your tongue back and move down towards her tight little asshole... You begin to lick slow circles around it and the sound of her gasps quickening tells you that its working... You start to thrust your tongue inside of her and you feel her hole tighten around your tongue as she begins to shake... "Ooooooo...." She whimpers as you finally push her over the edge... You continue circling her ass with your tingue while she rides out her orgasm... Eventually she calms and you sit up, half of your bet paid off...