The first thing that comes to your mind is your long time fantasy of being a bear. You have always admired those big strong and buff bear men in those lumberjack competitions.
"Genie I wish to be an anthro-bear."
The genie smiles wide and nods his head, granting the wish.
"As soon as you get home my young master, your wish shall be fulfilled!"
Minutes later when you walk into your house and close the door behind you, you begin to feel a pleasurable tingling course through your undeveloped body. You can feel your nipples shrink, harden and become erect. You also begin to feel your muscles ripple and bulge into massive mountains. All of this raw and sexual energy flows down and into your cock. It doesn't care if there was room to grow or not, it was going to and it would make room if it had to. On top of this, you notice thick amounts of hair sprout all over your new muscular body, in thick, dense amounts. As soon as your body was done, you run over to the nearby mirror and check yourself out.