>>14856231
I'm not sure of the exact doujin, but the artist is Sanagi Torajirou, as you can compare with my image. If this is still unanswered, I can search through later.
>>14856722
>>14856231
Found it. It's from [Sanagi Torajirou] Erect Erect Ch. 1-3. Seems like it's currently untranslated.