The Doctor groaned behind the rubber ball gag, as Katie squirmed against her.  She shivered slightly, the feeling of the other naked girl writhing against her bringing up unexpected feelings ....<br/><br/>But the girl was trying to escape, and Chloris tried to meet Katie's eyes with an encouraging look and a nod.  She herself then tried, as hard as Katie, to wriggle the bonds off of their bodies, hoping their combined struggles might prove more effective.<br/><br/>All it accomplished was to rub their bodies together more firmly, sending fresh shudders up and down Chloris' body.