“This wasn’t even funny,” Jonathan thought to himself in his brief respite from preventing these two massive orbs of flesh from bouncing and swaying. “My friends thought it would be a hilarious prank to leave my sister’s sports bra in my room with some tf powder in it so that when I picked it up to return it to her I’d transform into it.” It suddenly got harder for Johnathan to concentrate as his sister began to use the treadmill, sending her massive tits swaying side to side and giving them a nice bounce.

“Of course my sister eventually came into my room, looking for her sports bra… I think she was complaining that her others were too small, which I could believe, as her breasts pillowed out slightly on the side underneath her armpits.” He suddenly stopped swaying and bouncing as he felt his sister’s arm press into him as she took a swig of water before she started again at a higher speed, causing her melons to sway and bounce even more. “Did she have to work out today of all days? Shouldn’t I have known that my friends were gonna pull some prank on me for April Fools’? I mean… it’s not like I could’ve done anything, I had just woken up and was a bit groggy when it happened but still.”

His torment finally stopped as his sister finished up using the treadmill and began walking over to a mat. “Most guys would kill to be able to hold her breasts though, they’re big and soft and surprisingly smell good.” Jonathan’s thoughts were once again jostled as his sister began doing jumping jacks. “Oh god! I take it back!” The jumping sent Johnathan bouncing harshly up and down with her tits partially leaving the comfort of his bra body as she jumped up and harshly slamming back down into him as she landed, over and over again. She continued this for 20 minutes taking short breaks to stretch and rehydrate which just further disoriented Johnathan with all the movement going on. “Please stop! I’m begging you!” Jonathan mentally screamed out in fear to absolutely noone.

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It felt like ages but Johnathan’s sister finally finished her workout and dropped her drenched sports bra into her gym bag and headed home. Jonathan sat in the musk filled gym bag for what seemed like hours before a sudden light filled the bag. Above him were his friends which elated Johnathan. He was finally being saved from his torment but his hopes were dashed when he heard, “I’m sorry dude but Mike forgot to buy the reversal powder. We ordered it but it’s gonna take a week to get here so… Hang in there my guy!” And they suddenly closed the bag.

“Guys, come back! Please! Come back! This joke isn’t funny anymore! Guys!? GUYS!?” Jonathan futility pleaded from his dark, sweaty, and musky prison.