Use her hands.

 Krystal wraps her small hands around the half of the sharpclaws cock that isn't ravaging her throat, just barely managing to encircle it, and starts pumping in time with his thrusts.  Wanting to end this as soon as possible, she forces herself to bob her head and run her tongue along his length as well.
 With a pleased growl, he rapidly drills more and more of his bumpy dick into the dizzy vixen until he finally blasts her stomach with enough addictive semen to overflow and coat her heaving chest, continuing to spurt as he slowly pulls out of the frantically swallowing Krystal.
 "Mmmm, delicious,' she moans in spite of herself as his last shot covers her face.  She licks her muzzle while squeezing her tingling melons as fire once again shoots through her.  As she regains her senses, she sees the sharpclaw's still semi erect dick dangling in front of her.