Translated & edited by myself.
For DDL: http://smdc-translations.com/blog/c77-wild-kingdom-sensouji-kinoto-kurokoto-toaru-kagaku-no-railgun/
For all releases: http://smdc-translations.com/blog/

sissy? Wtf? Please change that shit! It sounds ridiculous! It is probably something like "onee sama!!!" so since it sounds ridiculous having her say "big sis" (since it is not that kind of big sis), I'd say you should go with the Japanese on this one.

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Sissy! I'm fucking done!

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"Sis" would probably work better than "sissy", that word means something else on here..

Base +11, Flavius1 -6, KiraKazumi +6

RAW: https://e-hentai.org/g/191587/67afc38a2e/

Base +35

That censoring is overkill.

Base +6

Anyone who translates "Onee-sama" as "Sissy" deserves to be shot on sight.

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'Sissy', really?

Base +6, MightyHonks +8, Hello my name is +6

封面吓人

Base +1

Translator probably watched the dubbed anime, which indeed translated onee-sama as "sissy" for some inscrutable reason.

Base +7, Hello my name is +6