https://www.dlsite.com/maniax/work/=/product_id/RJ419455.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_242604/

I have seen a page of the protagonist of this dojinshi walking on all fours and with a mask covering her face, but I can't find her anywhere. Nor does it seem that this dojinshi has more episodes published. Would anyone know the origin of these scenes?

Base +6

@Scatina
Could it be this one perhaps? Don't think it's the same character though.
https://e-hentai.org/g/984174/7237e97271/

Base +34

@Snappann It's not that scene. The two pages that I saw are of the same blue color and the girl wears the same discipline swimsuit, in addition to having the same mole. I will publish those pages in some networks to see if it is possible to find them.

Thanks for your answer n_n

Base +6