First, she needs to milk him.

Still holding Marcus by the cheek, Mistress lent forward over the trembling boy. Her purple eyes drifted over him, leaving what felt like trails of fire on his skin. Some part of him knew he should be so embarrassed to have his naked body examined so closely by a woman, but all he felt was that same hazy delight in knowing that this amazing goddess was paying him any attention at all.

"To begin the ritual, I will need a certain reagent from you." She purred, her lips curling. "Stand up." Marcus jumped to his feet. "First lesson, apprentice." She continued, reaching out a hand towards his bare chest. Her long fingers circled round one aching nipple, making him moan and shiver. "All magic takes energy, of one kind or another. The easiest source to access is that contained in the sexual secretions of either gender. I will use some of yours to guide this ritual, allowing my magic to be entwined with your own awakening gift."

Her hand moved lower, skating over his belly and then teasing down one thigh. Marcus bit his lip, trembling under her soft caresses. She was really close to his dick now. Her talk about sexual secretions had him blushing furiously, but he was still harder than he'd ever been in his life. The thought of this perfect woman making him cum with her own hand felt like the most amazing fantasy, far too good to be real.

Sure enough, she withdrew her hand just before touching him there, and he moaned softly in disappointment. His stiff little cock was sticking out, aching and throbbing with frustration. Only the thought of her disapproval stopped him from reaching down and trying to finish himself off. He watched her limply, pleading with his eyes. Instead of touching him again, she flicked her wrist and a silver goblet appeared in one hand, engraved with strange patterns. When she let it go it hovered in the air, moving down until it was right under the pink head of his aching dick. She smiled at him again, but there was something in her eyes that sent a flicker of alarm through him.

Marcus froze. He'd just felt something brush over his butt. Again it touched him, sliding over his cheeks and gently probing between them. It felt very strange, soft but a little slimy against his tender skin. He bit his lip, really wanting to check what it was but not knowing whether Mistress would let him. Then it started poking round his butthole and he went very stiff indeed.

The young prince gasped out, that uncomfortable feeling intruding even through the dreamy haze his new goddess cast over him. He craned his neck, struggling to look over his shoulder. When he saw what was there he felt panic surge through him. A long pink tentacle was wrapping round his leg, the bulbous round head sliding over the soft flesh of his butt. As he watched in horror, it started slipping between his cheeks again, going for his butthole. He screamed and jumped away, his hands flailing frantically.

"Silence." Mistress snapped and his voice died mid-shriek. He was frozen too, still half-staggering away from the awful slimy thing but utterly unable to move another inch. Without his frantic struggles to stop it, the tentacle resumed its probing.

Now he could feel it sliding over the skin of his thigh, as it wrapped tighter round his leg. The head was going for his butt again, drooling clear slime. His eyes bulged as it pressed against his tight little hole. Every instinct was screaming at him to clench and keep it out, but he couldn't move a muscle. There was a moment of painful pressure that brought tears to his eyes then he felt the awful thing pop inside him. Just the head at first, but even that felt impossibly big. It stretched out his rear passage, pressing against the throbbing walls of muscle in a way he'd never wanted to feel. And he was absolutely, sickeningly certain this horrible thing wasn't going to stop there.

Sure enough, the tentacle advanced inside him. He could feel every slimy centimeter sliding through his butthole, working the tight ring of muscle open again and again. At least the slime made it slip through easily, but that only added to the awful sense of wrongness. It slid inside him, twisting and probing, until suddenly he felt the head press against a certain spot and a flood of heat flushed through his groin and belly. Had Mistress not taken his voice from him, he would have let out a very girly moan.

Now the tentacle had found its target, it was even more merciless. It thrust deeper, then withdrew, pumping in and out of him in a way that drove the bulbous head against that same strange place inside him. Each time he felt his body respond, pleasure overwhelming the pain. Even the awful stretching pain of his butthole faded, and the pressure there somehow turned naughty and tingly instead. His dick was even harder now, the pink head so swollen it felt like it was going to burst. His tear-filled gaze fixed down there, Marcus watched in shock as a few drops of white pre-cum emerged from the tip, then dripped down into the silver mug still hovering in mid-air.

"The most efficient way to harvest a male's secretions is anally, apprentice. Remember that." His new goddess spoke again from the throne. Her voice was cool and strict, like one of his tutors, but there was a gleam in her eyes that suggested her interest in this subject was more than educational. "Semen has its uses, but in this case the fluids produced prior to ejaculation, when the subject is at a state of heightened arousal, are what I require. In other words, you will not be cumming for a while, not until I have what I need."

Marcus would have moaned in frustration if he could. Already the pressure in his dick and balls was growing hard to bear. Somehow the disgust and terror of the tentacle's attack had slipped from his mind, and all he could focus on was the maddening way it teased his poor butt. Thrusting inside, stretching him so nicely, then pulling back to stroke all his hot, throbbing flesh. Over and over, never quite enough to satisfy. If he could move now, he was sure he'd be pressing back against it, trying to drive it harder and deeper inside him. If it just did that, just pounded him a little harder, this awful teasing heat would reach a peak and he'd cum!

More pre-cum dribbled into the cup, and Mistress just lent back in her chair to watch, cool amusement in her eyes.