You need more.

As you take his long cock deep inside of your throat, you can't help but notice that you seem to be shrinking. Drawing back you lap at the head of his member, getting it nice and wet, you grip it in your hand and give it a little tug like you have seen in so many movies. You aren't really sure you want to be a girl but as you can feel and see yourself shrinking you know he has to be telling the truth. Soon a plan comes to mind, you can use this as an amazing magical diet. All you have to do is stop sucking and you won't become a girl at all, assuming he is telling the truth. Glancing at the mirror you would guess you are 140 to 160 lbs at the most. 'So I'll just stop.' You form the thought in your head as you dip your head down and take his balls into your mouth while stroking his rock hard meat. The feeling of your hips widening slowly, and your breasts growing between your arms is down right odd, but the strangest by far is the feeling of crawling critters as your hair becomes fuller and fuller on your head. Returning your mouth to his cock, you dip your now slender arms down your body, pausing a moment on your now a bit larger breasts, definitely at least a B cup now, down your tight sexy abs, and take your swelling cock into your hand. It feels so wrong feeling it's hard length as you bob forward slurping his massive member down your throat. 'No time for that, I have to stop sucking his cock.' Once again your form a thought in your mind, but once again your body does the opposite. his body tenses as you bob up and down with long strokes, taking him deep inside of you with each thrust, his sack slapping against your chin. You can hear him moaning, and he takes your head in his hands, gripping your hair in his fingers. Pulling back for breath you leave a trail of spittle connecting your lower lip with his rod. Pausing for a second you reach down and take your sexy tits in your hand and give the nipples a tug, to your surprise they seem to stretch a bit longer and perky standing at attention on your chest.

“Be careful, your body is in flux right now, anything you do will change you. Now get your mouth back here and suck me, or you won't finish.”

“What if you fuck my ass.” You ask as the thought suddenly creeps into your head.

“What? I don't know the spell says you have to suck me off and drink my seed, I don't think fucking you will work. We can do that after if you want.”

You give him another lick, but as you lower your head to take his cock into your mouth once more you stop, spittle dripping from your lower lip onto his shaft and rolling slowly down his length. You know what he wants you to do yet the idea seems to have taken root, and you can't seem to shake it. You just want his meat in your ass. You can't help it, you have never felt anything like this magic before, and it has your body yearning for cock. You can't let the idea go. “Fuck it. I have to know what it's like.”

“Wait what are you...” He starts to ask as you climb onto him. Locking your mouth with his you silence any protest, and as soon as you are on him you reach down, take his cock in your hand, and guide it into your hungry ass. As soon as it is in your body lights up, electricity shoots from your toes to your fingers and you grip tightly onto him, pressing your body against his, mashing your new titties against his chest. Planting your new sexy slender feet on either side of him, you go for it and start bouncing up and down on his rod, impaling yourself with each downward stroke. “Oh fuck you stupid slut.” He says breaking off the kiss, but it is so good he doesn't stop. Instead he decides to take control and tosses you off of him onto your knees. “Fine I'll give it to you hard and deep.” Grabbing hold of your now slender hips he pushes back in and soon his body is slapping against your sexy perky ass over and over again.

“Oh god that is so amazing. You are so big. Fuck, why is this so good. Oh fuck.” You want to say more but all you can manage is to begin moaning louder and louder till it breaks to a howl, then grunting screams. Pinching and pulling your breasts your head rubs against the floor as he pounds faster and faster.

Till finally he slows, “Wait, to change into a girl you have to swallow my cum.” He pushes you forward to pull out so you can drink it but you aren't really listening, your cock is spraying cum all over yourself and the floor below you. You slam back into him and he lets out a grunt, “Oh hell.” He yells out, and his body spasms as he proceeds to fill your tight ass with warm cum. Spent, he pushes you forward onto the floor and looks you over. You ruined everything. I knew it you would ruin the spell. Look at you, sure someone might think you are hot but there is no way I am wasting any more magic on you. Fuck, I was sure I was going to have a new fuck **** for the weekend.” He stands up. “Awe hell, just put something on and get out. Fucking dumbass.” Then he seems to come up with another plan. “Unless I can sell you to some kind of demon? Now that's an idea.” He says chuckling and walks out of the fitting room muttering something about checking his spell book.