This animated gif is from a parody hentai game called “Peach’s Mushroom Hunt”, where a horny Peach have sex with all the “enemies” she meets. In this animation, she’s fucked by a Piranha Plant. Here’s where you can download this hentai game: http://vanjas-world.com/blog/hentai-games/hentai-game-peachs-mushroom-hunt-hentai-world-game-series/
This animation was created by Vanja, and you can see more of her art here: