"Good girls deserve a treat. Now it's your turn to climax. Once you have done that, I will give you the choice if you want to return to your old life."
While the dick was more and more appealing to touch and caress, Willem was still hesitant to actually insert it into his vagina. He decided to keep the panties on as barrier, and just rub the bulging thing over the outside. It was a strangely arousing sensation, but not getting him anywhere near his goal to come to completion.
"If you want to be worthy of being turned back, you should be man enough to know how to please a girl.
First, you wouldn't stay in boxers and just rub your bulge against her panty-clothed crotch, would you? You'd go all inside.
Second, it's not your job to guide the penis and take charge - that's up to the man of house, which to you the magical dildo currently is. You are the girl. You lay back, submit, beg for it to go deeper and show when you have a good time."
Willem put the dildo aside and fiddled with the underwear bottom, still hesitant whether he should follow through. His decision-making process was cut short when a sudden impact threw him back on the bed. He tried to get up again, but failed to. The invisible wall had the texture of the rough palm of a man used to physical labour, and the strength that belongs to it. It was strangely erotic to feel the sensitive, soft femine skin pressing up against it the hard coarse surface. The maid's nipples stood up, as if they craved to feel such a manly touch.
The dildo was floating up, surrounded by the invisible force-field. That same force tore the panties to shreds like wet paper, and pulled the maid's knees and feet apart as if they were repelled by opposite magnetic forces. Willem had no choice but to offer his most vulnerable aspect of feminity to the willful apparition.
Willem held his breath, anticipating the dildo to take advantage of his helpless state and ram in with the same forcefulness. But it didn't. While the force field didn't budge, it formed telekinetic pseudopodes, caressing and massaging the sensitive skin, kneading the bountiful breasts and ass, and leaving sucking sensations as if being kissed all over the maid body.
It was strangely arousing to both be so tightly controlled, yet being so well cared for. But that arousal was in a very feminine way that made Willem not only very aware of being a woman in a strong male's embrace, but also happy with it.
Willem tried to distance himself from the events, picturing himself as an outside observer watching a porn, then from that vantage point imagining himself as the male making love to that beautiful young woman. But that took time and effort, and every time he succeeded to immerse himself in the opposite role, the dildo gently brushed against the outside of the grotto, as if by accident. That sent an immediate jolt of excitement through Willem's body, every time increasing his curiosity what it would be like to feel it inside, and making it harder and eventually less interesting for him to be the male in this act.
If he wanted to get off and have the witch lift that stupid possession, he had no choice to immerse himself in the role of the girl, to want to be the girl rather than want to ravage the girl. He thought back to the beginning - being the hesitant delicate girl that gets swept off her feet by the strong rough male, pinned down onto the bed, stripped of her final piece of cover, legs forcibly spread... Willa cooed as she immersed herself deeper into her new role. The force took that as an invitation, and began to insert the dildo into the grotto - slowly, gently, waiting for Willa to actively beg for it to go deeper and faster. It didn't take long until Willa begged, and begged again, and again, and again.
By the time she came, she sounded like an unsatiable slut. This time, the feminizing seed shot deep inside her rather than only going skin-deep, merging with the very fabric of her soul. But this wasn't a penis made of flesh that would go flaccid after reaching climax, this was a magically infused rod of hard plastic that could keep going. And the feminizing seed made Willa crave cock even more strongly, and made her capable of more and more intensive orgasms. So she begged the dildo to ravage her harder, only to feminize her mind and desires further so that she would beg even harder.
That vicious cycle continued many times until Willa finally collapsed from sheer physical exhaustion. But she didn't find it very vicious at all. A big glowing smile graced her face as she was basking in satisfaction. Wait, Willa? No, Mimi, no, not that one either, my name is - Sleep overtook her before she could finish that thought, her dreams being a mix of confusion, feminine bliss and the transformative seed working on her very self.