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This appears to be a sequel to a previous work of theirs. A bit confusing since the titles would lead you to believe otherwise. https://e-hentai.org/g/2856563/58577aa720/
@7452077 that line appears to be a misTL; if I understand the JP correctly, it's more like "Having you take my virginity would be a little, y'know, so…" (or more literally, "Y'know, having [my sister] for a partner the first time I do it with my vagina would be [unspecified, implied negative], so…")
original: 流石に、まんこでする初めての相手が姉さんなのはアレだから…
I can see how the error would've happened (and Google Translate makes a similar mistake lol), but I think the intent is pretty clear in context.