Looks like we dug up a little more context are this oldie but goodie from a twitter post a few years ago
https://twitter.com/yUUkiy_kAMatA/status/1064094163258359810
apparently from an anime/manga called ムスメット , "ryuusei sentai musumet" (Maybe RGB is appended to that particular occasion when theyre tickled?)
it also just appears to have been a one page thing in a Megami magazine but i couldnt find anything (not that i looked that hard though, dont really have any tools other than google)
When I look closer i can make out the dates 2003 and 2004 on one of the pages, its likely to old to track down. but its such a good scene weird it wasn't more popular.
the good thing is that most of the text is for the most part legible so if anyone feels up to even just trying to provide a type up of the japanese text that might be possible and it would be easy to translate from there. (actually looking at the text i would imagine you would have to be very familiar with japanese and kanji to probably actually do that some of the characters look pretty unreadable, sorry about that, maybe its an unreasonable thing I asked.)
EDIT: the poster of the tweet actually noticed my attention to it on twitter and replied with another better image of the page and where it was published along with the cover, it was very nice of him!
"Manga "ryuusei sentai musumet" serialized in "Megami Magazine" in 2004
It's novel "Musumet RGB"
This is the scene in episode 4 where Musumet is tickled and tortured by the enemy.
Appeared in the April 2004 issue"
AND
In Episode 3, I infiltrated the enemy base, but was hit by an electric attack and was forced to take off my swimsuit and be restrained.
The three sisters who resist torture but can't hold back their laughter and are shy are cute.