Lisa moaned around the gag again, still pulling against the bonds, though with no actual success.  While Mareth was content to slowly pleasure herself, Lisa definitely wasn't, thrusting her hips forward wildly and shoving the toy deeper inside both of them.  She was soon panting, both with effort and with pleasure, though she didn't seem to be tiring at all.  Instead, it almost seemed that the more aroused she got, the more energetic she became.