it’s not an accident with this guy. Chuuya could lock the door when he is changing so no “accidental” walking in would be possible. But actually Chuuya likes to tease his partner, especially a shy one that would be embarassed over the whole situation. Chuuya is not affected at all when his partner sees him partly naked. it’s not like they would never him see him like this
his only reaction would be a sly smirk, saying they should watch that their jaw doesn’t drop when they stare there in shock. How can he be so casually about this?
Odasaku
Odasaku merely blinks, maybe he is a bit ashamed (since I think they see them naked for the first time, otherwise it should not be an issue to change while the partner is there) but he was his fault for forgetting to lock the door
he apologizes in his s/os place and saying that he will lock the door next time, wasting no time to quickly dress himself
Ryuunosuke Akutagawa
You:
he stops every motion, blinking in mild surprise but get annoyed rather quickly and demanding his s/o to get lost immediately. He would not be happy at their stares and pushes them outside with force
he then makes a mental note to lock the fucking door
~My Tumblr Back-Up And Stuffs~ 