Kelsey watched the two with interest.  "You know, it really looks like she likes it a lot in there.  Let's see how she feels about this!"  With a mischevious grin, Kelsey slithered over to where Andrea's legs were sticking out of Crystal's mouth, grabbed her feet, and began to tickle them with the tips of her forked tongue.  As soon as her tongue had touched Andrea's skin, however, Kelsey's eyes went wide.<br/>"Oh, shit.  She tastes fucking DELICIOUS!"  Kelsey's tongue stopped its feather-touch tickling and began to slather over Andrea's feet in earnest.