As they built rhythm and desperation, grinding into each other, Ty and Amanda were now hot, sweating, and panting. She grabbed her baggy shirt, ripped it over her neck and threw it away passionately.
"Can I touch?" Ty asked gently, staring at her B-cup breasts, as small and adorable as the rest of her now was.
They both giggled as Ty realized how stupid his request was.
"Of course, honey." Amanda panted. "Go ahead."
Ty gently placed his hands on the firm little orbs, squeezing them experimentally, touching the nipples. Never ceasing his fucking, but slowing down.
"I know you like them big." Amanda said with a lusty whisper. "Big and heavy."
Ty's eyes widened. "Oh... wow. Can I?"
"I'd be insulted if you didn't. Blow them up. Do it!"
Ty closed his eyes, his dick hot and almost ready to blow as he kept fucking her, and placed his hands over her boobs, fondling them.
"As big as you want them. As big as you want me to be. Please."
Honeydews. Ty gulped. Big, firm, round, perfect melons.
And Amanda gasped and groaned, eyes closed, as Ty bucked into her and her tits grew.
She opened her eyes long enough to see her chest swelling in size, and marveled at how good it felt.
"Yes..." She gasped. "This is so kinky. Grow me! Bigger, bigger!"
They had gained size and shape, pressed out and filled out bigger and rounder. Ty now had a full palm of tit. And while they were firm and shapely, they were also soft and squeezable. The girl's nipples hardened under Ty's palms. She began to moan as hid dick hit inside her harder and harder.
"Yes..." She gasped. "Yes..." She grabbed her hair and wringed her fingers through it. Both were consciously trying hard not to make too much noise, lest they alert her dad. "Fuck meeee...." Amanda gasped. "Change meee... moreee..."
Ty felt his climax approaching and wished her tits even bigger. Her body curvier, shapelier. He wanted Amanda to become a gorgeous brunette bombshell. More beautiful.
She orgasmed. He didn't know it, but she clenched all over, spread her legs wide, and hissed as she released. Gripping the bed sheets, turning into a young supermodel. Big tits, tight body, cinched waist, curvy thighs. Softer face, plumper lips. Still herself, still looked like herself, but more seductive. More beautiful.
He followed soon after, spilling forth his seed. Both of them panted, collapsed, and laid there in a stupor as Ty softened inside of her. Their juices leaking onto the bed from within Amanda.
"I love you." She whispered softly. "I always have. This is just icing on the cake."
"Me too." He admitted, and they embraced warmly and kissed. In just minutes, they were fucking again, thanks to Ty reducing their joint recharge time.