Just watch for now

"Wh-why am I..?" Makoto muttered, trying her hardest to keep her composure as an orgasm washed through her body. The "new" weight of her breasts and lack of understanding of how to use her ass to sit caused her to flop to the floor, her legs trembling as she whimpered and moaned.

Sadayo, meanwhile, slumped back in her seat, still grabbing at her breasts and trying to understand them as she moaned out in pleasure.

"I don't understand... What... What's going on!" she whined.

Sumire, meanwhile, had figured out how to "sit" without using her ass by straddling the chair, basically using her pussy to sit down... Which was causing her to grind against the chair thanks to the orgasm.

"Nnng... S-senpai..." She whispered softly, her face turning red.