Finally found the gif, mildly nsfwMy friend got me into Shokugeki No Soma, I thought it would be a stupid anime bordering hentai but the story is actually really good and it's just hilarious overall
All I knew from it was seeing the gif on Reddit a while where the girl and her bodyguards start eating and literally cum themselves
I got so hooked on the anime I read the whole manga in just a few days of binge reading, I really recommend it
http://www.mangapanda.com/shokugeki-no-soma
http://i.imgur.com/z1Koqad.gifv