The bra, Dawn decided after a second's thought.
The bra had to go.
But not just go. She had to do something with it.
Focusing her thoughts, Dawn made sure she was ready for the complex series of actions that would be required.
When she was satisfied she was ready, Dawn snapped the strap of Tara's bra. Before Tara could realize what was happening, Dawn focused her thoughts on the cups and used them to pull the bra clear of Tara's breasts and down over her arms.
Tara gasped as her bra suddenly, and inexplicably, slid off her body. She reached down to grab it, but missed.
Dawn slid the bra around behind Tara's back, thinking that she would reach back for it.
It worked perfectly.Tara brought both of her hands behind her back, looking behind her in an attempt to catch her bra. When Tara's arms were behind her, Dawn wrapped the bra straps around her wrists, pulling them tight, binding Tara's wrists together behind her back. She knotted the ends together.
Dawn cast two more spells in quick succession then. The first spell made Tara's bra straps shrink by 10%, enough to cause them to tighten painfully around her bound wrists. The second spell was more important to her. It was a simple spell that would prevent anyone else from undoing the results of her magic. Only she could stop the spell from working, and as long as it lasted, no one would be able to untie Tara, or cut the bra off her wrists, or do anything at all to free the bitch.
Tara was standing now, eyes wide with fear and also, Dawn was pleased to see, shame and humiliation. Her mouth was moving, but no sound was coming out. She looked alternately behind her at her bound wrists, then at her classmates, then at her wrists again. Dawn could see her moving her arms, trying unsuccessfully to get her hands free of her bra-bondage.
Dawn took a moment to enjoy the scene in front of her, enjoy every second of Tara's humiliation, watch her try to free her hands so that she could use them to cover her sudden nudity.
Okay, what next? Dawn thought.
Before she could decide . . .