Sarah got a mischievous grin as she grabbed her boyfriend's underwear from the pile and laid them aside. She unbuttoned and unzipped her leather jeans and pulled them off, laying them on her bed. She wiggled her butt out of the black thong panties she was wearing and quickly hid them with Rob's clothes.
Sarah then grabbed her boyfriend's boxers and slid them over her shapely ass. They were quite wide on her, but really comfortable as she reveled in the feeling. After admiring her new underwear, she quickly grabbed her leather pants and squeezed herself into them once more. Due to the larger underwear she was wearing, the pants weren't as smooth as they were supposed to be, but because they were a little stretchy they still fit just fine.
Sarah was about to walk off, happy with her new underwear, but she decided she'd have to leave Rob with her full underwear instead of just the thong. She skillfully managed to unhook the bra underneath her crop top and managed to slip it from under it. Sarah hid the bra alongside the thong and decided this was enough for now. She decided to grab a drink while waiting for Rob to come out of the shower.
After some relaxing minutes of cleaning himself, Rob came out of the shower feeling very calm, but this was about to end as he started to search for his underwear. He searched through the pile of his clothes, but only found a black thong and matching bra, much to his horror.
"Sarah! Did you take my underwear?" Rob yelled downstairs, not getting an answer. She heard him, but was too busy giggling.
"Dang it Sarah." Rob said to himself as he grabbed the tiny thong belonging to his girlfriend and stepped into them, feeling tighter and tighter the more he pulled them up. They barely covered his privates at all so it wasn't exactly a good fit, but regardless, he dealt with it and pulled up his ripped jeans.
Rob was putting on his shirt as he saw the bra being uncovered in the pile. He looked down at his chest, but he didn't see any reason to put it on so he simply finished putting on his shirt, grabbed the bra and went downstairs to confront Sarah.
"I think you forgot something." Rob said annoyed as Sarah grinned at him madly.
"You were supposed to put that on, let me help you." Sarah said as she tried to forcibly put it on her boyfriend, but she was much weaker, so it didn't really work.
"I'm already wearing your damn thong, there is no way I'm wearing your bra too." Rob said sternly.
"Oh poo, you're no fun." Sarah pouted.
Rob looked over his girlfriend, he though she was the cutest thing ever, especially when she was mad.
"If it will get you to stop being mad, fine, help me put this thing on." Rob said reluctantly handing Sarah the bra.
"Pay attention, I'll only show you once, you can take it off well enough, so you should be able to do this." Sarah grinned as she helped Rob put on the bra.
"This is uncomfortable." Rob said as he felt his privates rub against his girlfriend's soft panties.
"I don't know what you are talking about." Sarah giggled as she shook her ass.
"Your ass doesn't look as good like that." Rob said, as if a bit disappointed.
"Well, your boxers don't look that good with my pants." Sarah admitted.
"Then how about you give them back?" Rob said a bit annoyed.
"We can also swap pants." Sarah said giggling.
"No way, they won't even fit." Rob said taken aback.
"They stretch a little." Sarah said eagerly.
"Yeah, a little, but not enough." Rob complained as Sarah just eyed up his pants.
"Aren't you curious how they feel? I know I am about yours, don't worry, I want to look good so I won't keep them long." Sarah said trying to convince her boyfriend.