Luckily, it was your mother sneaking up behind you. The hell if you need an even bigger version of your brother.

Almost immediately, your mother begins to change. Muscles grow, slowly filling out the outfit she was wearing, which was a t-shirt and a pair of shorts that reached her knees, since it was a warm autumn day. The muscles of her arms, chest and upper back stretch the fabric of her shirt, taking the top nearly to its limit.

Her arms grow from a small, shapeless arm, to a fitness chick's arm, then more. Five inches become ten, then 15. Then more.

Her chest muscles expand, packing on pounds of muscle underneath the constantly growing orbs of breasts that continued to inflate.

Leg muscles enlarge like tree trunks, growing with added size and power with each passing second.

By the time the process is complete, she has 18" arms, 30" thighs, and a midsection literally packed with muscle, as her abdominals and obliques pushed prominently against the fabric of her shirt now.

"Hi, mom," you meekly say afterwards, not knowing what her response would be. Which is why you would have preferred to change your mother without her knowing about it, so that if she didn't like it or was angry, she wouldn't have known who did it.

"Well...," your mother begins, taking in the changes she just experienced. "This is different."

"You're not mad, are you, mom?"

"No, no, sweetheart. But..."