While Vipress toyed with the idea of using the potion on Brendan, she came to a realization that excited her. Who knew what would happen to her slave? She... didn't want to harm him. She needed him.
"Brendan..." She whispered, lost in the steamy mist of their shower. This elicited shock from the teen: the mistress had used his name. "Let'sss ussse it on me."
"Y-Yes Mistress." The boy stammered, and raised the open bottle to her lips, preparing to pour. "How much?"
She considered how a few small doses had rendered her almost ten feet long and thicker than Brendan's upper arm. "Not too much..." With that, she closed her eyes and opened her mouth.
"Here we go." Brendan whispered, and poured a healthy amount of potion into Vipress's jaws, watching as she gulped it greedily.
Staring at the bottle, Brendan saw only a quarter left. He slipped his hand out of the shower and returned it to the lid of the toilet.
Meanwhile, the blue scaled Vipress - already aroused - clenched herself suddenly against Brendan's body and winced in pleasure. "Ohhhh!" She moaned, shivering. "Yesss!"
She opened her eyes and stared at her slave, loving every second of the sensations. Suddenly, the world began to shrink in front of her slitted reptilian eyes. The sensation of growth built among the warm steam of their shower. She was in rapture.
Brendan watched, hugged her close, eyes widening, as her mistress grew larger and heavier around him. Her coils inflated around his body, thickening, and her tail stretched longer, encompassing him. Her head raised up, growing, and she curled her neck down to look at Brendan, now so tiny in her grasp. Soon she was able to wrap around her slave with several feet of length to spare, and her girth had increased to the width of Brendan's thigh. her back brushed the ceiling and her blue coils filled the shower.
She had grown impossibly larger, ridiculously huge, now nearly twenty feet in length. "Well..." She looked down at her tiny human, lowering her face to his. Her entire head was now twice as large as his. She flicked her tongue across his face and smiled as it crossed his entire cheek and touched the back of his head. "Thisss isss interessssing, yessss?"
Brendan gaped, awed at the goddesslike size of his mistress, and then grinned. "You're enormous!"