Sauce please? I cant find it anywhere.
Preety sure its a Resort boin character
http://www.world-art.ru/animation/animation.php?id=6727
But cant find that moment in hentai itsself so i must assume its from game maybe.
Oh wait...after further searching found it! on ex-hentai.
https://exhentai.org/g/326855/07e96b5925/
Boin Mika + Densya Boin