This is a short 2 page story by Terasu MC. It's been shared on this SubReddit before (as Sister's Guidance vs Reality) but a different translation. I can't find information on who made this Translation but that Translation is by CarlJPTL and is the one found with another two page story together titled Bite Sized Erotic Comic 2×2.
This Translation was harder to find. It's part of a collection called Terasu MC Various Shorts, but only the versions of that collection with 205 pages, these being the last 2.
If I went line by line I would definitely say the CarlJPTL version is better in most of the time, but much of it is close enough that the few things I prefer in this version make it a worthy read on it's own. The thing I most prefer in this version is how the panel describing the little bother “be a with a woman to his satisfaction” is vaguely weird phrasing, simply saying he never had a Girlfriend gets the point across better.