Gemma delays you.

You move your weight back down Gemma's body intending to get this over with as quickly as you can. You pin one of her flailing legs down with your knee, putting your full weight on it. You grab her other leg, intending to put it over your shoulder to spread the bitch's legs open. As you attempt this Gemma suddenly bends her leg sharply bringing her knee up to her chest. She plants her bare foot against your chest and kicks her leg out straight as hard as she can.

"Gurghh mmuphhh." She howls through the gag.

Her kick propels you backward off the bed with such **** that you actually hit the wall several feet away. Abruptly out of contact with Gemma and sporting a raging erection you feel the change beginning. You desperately try to lunge back towards the bed, but your impact has knocked the wind out of you and you you simply fall forward onto the floor.

"Nooooooo not now." You wail as feel your skin rippling.

The change robs you of any chance to get back on the bed. You lie writhing helplessly, your muscles twitching uncontrollably as you feel you form altering. It's quite a few seconds before you can lurch unsteadily to your feet. Gemma is struggling hysterically with the cords binding her wrists to the bed, but they have held fast. As you stand and come back into her line of vision her head turns to look at you. Her eyes shine with angry triumph as she sees you back in your female form.

"Raagh muh nnargghh buhhhh." She chokes.

You look down at yourself, feeling the heat between you legs as the horniness you always experiance as a girl begins to grow.

"Very clever Gemma." You say. "But you've only delayed me. I can change myself back soon enough. I can't blame you for trying to stop me though, but I'll be more careful next time."

You get the remaining cord and carefully approach the bed. Gemma draws her knees up and tries to fend you off by kicking out at you. You have to dance around to avoid her foot a couple of times, but then succeed in timing yourself to dodge and grab her ankle next time her leg strikes out at you. It takes both hands and all your diminished strength to keep control and knot the cord around Gemma's ankle, but after a struggle you managed to tie it to the foot of the bed.

"Just one leg to go." You pant, breathing hard. "Just need to find something else to tie it with."

You rifle through Gemma's clothes drawers looking for a similar cord. You find one drawer containing stockings and tights and figure that these will do the job nicely. As you sift through them you feel something solid underneath and you push the clothing aside out of curiousity. Under the clothing you find a vibrator and pull it out and examine it with fascination.

"Well well Gemma. Who's a naughty girl then?" You chuckle. "Not that there was any doubt of that anyway. This will make changing back to male a bit easier."

You put the vibrator down reluctantly, forcing yourself to finish with tying Gemma before you try it out. With just one leg still free it's much easier this time to grab and wrestle into position. Using a pair of stockings you tie Gemma's remaining ankle down to the bed. Though she's spreadeagled and firmly secured Gemma still shows no sign of submission. Her well developed muscles strain as she continues to struggle to break free and you suspect that the angry muffled sounds from behind her gag are a torrent of foul threats.

You pick up the vibrator again, it's pretty big and fat with a protrusion sticking out near the base designed to press against the clitoris for added stimulation. You sit next to Gemma on the bed. As she twists and strains against her bonds, her dark bald pussy shows glimpses of wet pink flesh through it's crinkly lips. You feel a pang and a shiver of excitement, wishing for a moment that you were in Gemma's place feeling the cords tight around your limbs.

"You just sit tight a while Gemma." You tell the angry, struggling girl. "I'll be ready for you soon enough."

You switch the vibe on feeling the insane buzz of it's shaft on it's highest setting. You're already sopping wet in the anticipation of sliding the hard throbbing toy up yourself. Or maybe you should try the vibrator out on Gemma's musky little snatch first.