As this is a production intended for adult audiences, it contains explicit themes and content. Further technical details regarding the production staff and voice cast can be found on various media database websites that track animated releases. Uchi no Otouto Maji de Dekain Dakedo Mi ni Konai? - IMDb
Convert suspected romaji back to kana/kanji: uchi no utouto maji de dekain %C3%B1ame manga
If you do find a manga matching this description, update this article’s comments immediately. Until then, happy (and sleepy) reading, and may your yams always be just the right size. As this is a production intended for adult