How to gain mass FAST?

i have a briskly matabolism...and i want a chest lol DONT EAT JUNK FOOD!
Even if you do it wont make you gain b/c of your express metabolism... so dont even bother and clog your arteries.
There is no magical way to get you fat.. what's wrong next to being skinny? I need I was 90 pounds...
Do push ups they put together your chest bigger [yes, its scientifically proven].
eat a box of crispy creams