"Please, I have been deformed my whole life. I have not been cruel to anyone and have only tried to help wherever I could. Please give me the ability to do more by making my body more in proportion to a normal metahuman being, somewhere between a dwarf and a human would be ideal but I will take whatever you can offer. In exchange for this favor I will offer some of my essence to you, enough to sustain you, but at the limit of what would kill me...I gladly offer this to you in exchange for my growth."
He steps forward a little bit and opens his arms to the side and leans his head back, closing his eyes and waiting to feel whatever happens.