what hentai is this

Not a hentai nor doujin, it's just one image drawn by シャモナベ : https://www.pixiv.net/en/users/5928132

Here they link the original artist to op's picture (just click the name next to "by": https://pixiv.kurocore.com/illust/65254889

You can find their +18 content here (but you'll need an account to access): https://www.pixiv.net/en/artworks/65254889

Not a hentai nor doujin, it's just one image drawn by シャモナベ : https://www.pixiv.net/en/users/5928132

Here they link the original artist to op's picture (just click the name next to "by": https://pixiv.kurocore.com/illust/65254889

You can find their +18 content here (but you'll need an account to access): https://www.pixiv.net/en/artworks/65254889