His older sister's bra

She returned a few moments later, surreptitiously hiding something behind her back. From his angle on the floor Josh couldn't make out what she was holding. "Sorry that took so long sweetie" she cooed in a mocking tone "I had to pop to the laundry room to find your present, I thought mine might be a bit big for you". As she said this she produced a bra, much smaller than the ones he'd seen in his mother's laundry basket, it must be Holly's he reasoned. He was relieved when he realised she'd have to untie his hands to put it on him and he could use that as an opportunity to escape, although did he actually want to?

His heart sank when, as though she'd read his mind, his mother let out a menacing giggle. "Don't worry, I found a nice strapless one so we don't have to fiddle with your little restraints" she smirked.

Josh moaned into his panty gag in protest as his mother placed the cups over his flat chest. She slipped a hand inside the loose cup and twisted his nipple, hard. "Quiet now, there's a good girl" she cooed as she reached behind his back to fasten the clasps. She stepped back to admire her handy work, her look of smugness turning to surprise as she realised Josh's chest was changing, his nipppes puffed up and his areola grew larger as two small mounds began to push their way out, desperately seeking to fill the material of the bra. "Well" she mused "that explains my new toy then". She smirked as she began slowly jerking her hard cock in Josh's face, enjoying the show of his budding breasts growing by the second. Within a few moments the transformation was complete. Josh now had his sisters D cup breasts rising and lowering with each anxious breath.

"This opens up a world of new possibilities" his mother mused