Something was bugging Andrew, the way the genie had stated the condition of the wish. 'Ok, but remember, that if so one transforms, they have to gain weight.' On a hunch Andrew willed himself to gain 400lbs of muscle. Immiditly his arms swelled with strangth, pecs inflated, thighs thicked, and abbs popped turning him into a hulking slab of muscles. For his transformation he became a anthro gorilla. His hands and feet grew thick and meaty as black fur spread across his body and his skull reshaped. Giving him a slightly triangular head with a big wide jaw.
The strangth he felt was incredible! Still in the arcade he picked up a metal chair resting in the corner. It felt light as a feather and bent beneath his grip. He took both ends and twisted the chair into a knot, bending it like copper wire and leaving it on the floor.
He then willed his gut to gain 200lbs of fat. The flat washboard abs flopped out like an exploding bomb. It sat distended before him so far he couldn't reach it with his hands. He then transformed himself back to normal and fully clothed.
The ability to add muscle and target specific parts was a nice touch. It seemed the geni's wish just required weight, not specifically fat although that's what he planed to use the most.
Andrew left the arcade and headed to his car. As he left the parking lot he decided to use his new powers on...