Large

"Well with choices like that how can I resist a large?" Brendan said slyly.

"How indeed?" Amy responded. "Now listen closely and strip naked." She smiled as Brenden quickly disrobed. "Now then lets start with these 'Big Boy'" she said handing him a what looked like a male striper thong.

"I was hoping for something like this." He smiled noticing the crotch area had quite a bit of extra fabric. He slid them up his legs and felt his manhood swell up. "A big upgrade over that little thing I had last time. So how about the rest of this guy I'm gonna be?"

"All in good time put these one and find out." She said handing him a pair of tight jeans that were longer than the ones he usually wore. Excitedly he started to slide them on and it was a struggle at first but eventually he managed to slide them up as he felt his legs mold to them. "Are they supposed to still sit this tight? I don't usually wear jeans this tight but it's kinda cramped in... ya know."

"Oh I figured that might be a problem, but tight clothes show off everything better. Here this will make your arms and chest look great too." She said handing him a long-sleeve maroon t-shirt.

"I guess you're right I like the way it shows off the big guy." Brendan said nodding to his crotch. He took the shirt and noticed that it had buttons halfway down the center. 'Strange style.' He thought as he slid it over his head as he felt his body shifting. He looked down to start buttoning up the shirt only to see his chest start pushing out. He stared surprised as it kept growing and growing pushing against the confines of his shirt. Moments later he had to large breasts sitting on his chest. It was then it clicked that the pants weren't just tight jeans, they were women's jeans. He looked at Amy to see her grinning ear to ear.

"Big girls to go along with your big guy. Now go ahead and throw these on so we can finish up your look." She said holding out a brunette wig and pendant necklace.

"But why I thought I was gonna get to be a jacked dude?" He protested.

"Oh don't worry sweetie you're jacked where it counts." Amy whispered as she fastened the necklace on him. He took a sharp breath of air as he felt his vocal cords contract and heard himself rise in pitch. Next he felt hair drape across his shoulders.

"But, but I'm gonna look like a freak with this monster between my legs now." Brendan protested wincing at his new sultry voice.

"Oh trust me Brendan." Amy said guiding him to the mirror. "Nobody looking at you is gonna get past the girls."