Yuki smiled with every whimper and cry from Lisa, kneeling down next to the girl.  "Would my little pet like to cum?" she asked, tauntingly.  "Very well.  You may cum once.  After that, I'll give you a few new toys.  How does getting your nipples pierced sound?" she asked as she went over to her bag of toys, pulling out her piercing kit and picking a pair of small golden rings.  "I think these will look cute on you.  Maybe your guests will even see them poking through your top while you're working, and decide to play with them too.  Doesn't that sound fun?" she asked, a rather sadistic grin on her face.