I'm in agreement with dakski...your corn doesn't look skinny to me, not one bit. Don't fall for that "pitiful look" ("I'm starving, I need more food!")
I feed adult corn snakes ONE adult mouse about every 10 days. When a snake is over-fed for a while, just like people, they may get "used to eating
more than they should" so you'll have to be the grown-up in the room, lol.