You decide to give it to your apprentice

You can easily **** any one of your servant maids to take care of it, but that is not your style. You’d much rather give it to your fiancé. Not just because she would happily accept it, but also cause you prefer to give it to her over anybody else.

When you get to her room Alice is already gone. But Doe does have her flute and is practicing on the instrument. Your sudden intrusion into the room startles her, leaving you unable to hear how skilled she is in playing the instrument. Though at this very moment you’d much rather have her playing a different instrument.
“Oh, John. You’re back.” Doe says as she stands to greet you.
You quickly grab her in a passionate hug and kiss her right away. Doe is surprised at first, but quickly returns your affection.
You break the kiss and say, “Sorry for being so forward but I’m really horny right now and I could very much use your assistance.” After which you go back to kissing her.
“Mmm, ok.” Doe says between kisses.
Immediately you feel her hands slide into your pants and pull out your erect dick. Then she breaks the kiss, she gets onto her knees and starts sucking you off. In return you caress her ears. You close your eyes and gasp while thinking Doe is the most wonderful woman you have ever met.

“So how did Alice’s treatment work?” You ask Doe.
The foxgirl takes your dick from her mouth and starts masturbating you.
“It was great. Letting myself drift away on her music was so relaxing. I was so intrigued I asked her if I could borrow her flute and learn to play it myself.” Doe says.
Then she shoves your dick into her mouth again and resumes blowing you.
“I’ve made quite an interesting discovery myself.” You say. “I think I discovered the meaning behind the all of the tails.”
Doe pulls your dick from her mouth, making a popping sound. Says, “Tell me.” Then slurps your dick back between her lips.
“I believe it telegraphs magical aptitude. The more powerful you are, the more tails you grow.” You explain shortly.
“I see. That makes sense.” Doe says. “When I first started learning magic I had only two. After training I got three and now I have four. And Robert, who is already experienced got four tails immediately.”
“Which made me wonder.” You say. “Just how many tails would someone like me get when I were to be transformed.”
Suddenly Doe stops. She looks up at you, a bit shocked, and asks, “Wait … You want to become a foxboy?”
You smile down at her and say, “And I want you to transform me.”
Your apprentice’s face light up. She stands and hugs you, giving you a romantic kiss on your lips. You can taste your dick on her tongue, but you don’t care.

While kissing you can feel her take off your clothes. Standard procedure before transformation. When you’re nude your apprentice guides you to your bed. You lie down on your back. Erect penis pointing upward. Doe then starts taking off her clothes. That’s not part of procedure, but you honestly don’t mind being transformed by a beautiful nude woman. Then Doe joins you in the bed, straddles your lap and gets your dick into her pussy.
While riding you she brings one of her tails in front of her and caresses it. Hairs from it come loose and stick to her hand. When she’s done she drops the pile of her hairs onto your belly and prepares the transformation spell.
Your apprentice smirks at you and says, “I’m going to impregnate your entire body with fox-DNA now.”
You laugh and reply. “Well, I already did it to you before. And then I impregnated your eggs with my sperm too. So fine, go ahead and infuse your DNA into my cells.”
Your apprentice then holds her hands over your belly and casts her spell.

When Doe’s spell becomes active you feel a tingling sensation. You watch as your skin become like liquid and the fox hairs melt into your body. While she casts the spell, Doe continues riding your dick. You put both your hands on her hips and slowly fuck her in return.
“Mmm, merge that DNA.” You hear her moan.
Then the tingling transfers into warmth and starts to spread across your body.
“Oh yes, spread that DNA. John! You’re receiving my genes into your cells.” She announces in pleasure as she fucks you faster.
You then notice something primal building up in you. A yearning for sex like you haven’t felt before. A desire to fuck any pussy, no matter who’s it is. It is something quite unlike you. Did all the other subjects also feel this lust when they transformed? Mia, Olivia, Doe … your lieutenants?
Luckily you already have your dick inside the woman you love. You take a firm hold of her hips and start fucking her faster and rougher.
Her breathing becomes heavy while she eagerly meets your thrusts. You start to worry if she can properly keep focus on her spell while getting fucked and not mess it up.

Then the warmth spreads to your head and you feel your ears change.
“Your ears are changing.” Doe moans. “I’m making your ears change. Ooooh, i’m transforming yoouu.”
Suddenly you feel the warmth spread to your tailbone and beyond. You quickly tell your apprentice what was happening.
“Doe, I’m growing tails!” You moans.
“Yes, honey. Grow some tails for me. Plenty beautiful tails.”
The bulge above your butt grows quickly. It pressed between your back and the bed. You bring your hands to the bed on either side of your body and push yourself up with your hands and your feet. Doe raised her hips to give you space, but you two never stop fucking. Just at the moment your tails sprawl from underneath, you reach climax and cum inside your apprentice. Both of you moan loudly as your balls pump her full of semen.
When you’re done, you drop back onto the bed. Your dick plops out of Doe’s pussy. She Then drops her body next to you. You catch your breath and so does she. All you can think of now is how much you have changed.