A tingling sensation spread all over your body, and you felt your cock twitch in anticipation of something. "Wha- what are-" you gasped, having trouble talking through the intensity.
"We're making you one of us," Claire grins. No way... she can't mean...
You whimpered as your nipples perked up. They swelled, growing wider and longer as they got erect. You saw two of the girls' hands reach down and pinch them, and a girly moan escaped your lips. You even felt a tingling in your throat as your adam's apple vanished.
Their hands moved over your body, stroking along your arms and legs, and you convulsed and shrank under their touch. Your arm and leg muscles got more lithe, your hands and feet shrank, your hips widened, your body hair vanished... everything seemed to get reshaped.
The two girls put their mouths to your nipples and licked and sucked at them, making flesh swell out around them until you had soft, perky breasts. They each squeezed one and you moaned more. By now, your penis was the only part of your boy's body that hadn't changed, and it had gotten so aroused you came without anyone touching it. One of the girls put a glass around it and made sure your thick seed got pumped into it.
As soon as you finished ejaculating, your milked testicles moved up inside you and changed into ovaries, while your shaft began to shrink away rapidly. The girl who'd milked your cock pressed her fingers against your scrotum, flattening it and splitting the seam down the middle to give you a vaginal slit, and using her thumb to flick your cock as it finished receding into a clitoris.
You stared at the girls in amazement, gasping with pleasure, now you'd finished changing. What the fuck were they gonna do next?