She unlocks his powers, at the cost of more pain

Marcus stood and suffered, feeling this awful tentacle exploring every inch of his insides. It's progress through his guts was marked every inch by cramps and stretching pains that would have had him screaming and rolling on the floor where he able to move. Out the corner of his eye, he could just glance down and see his horribly swollen belly protruding like he was pregnant. Worse still, even though it felt like hours had passed, Mistress showed no sign of stopping this. Instead, she just watched him, her head cocked to one side and a curious look in her eyes. By now, it was very hard to love her anymore.

"Ah, I think I have something." She purred suddenly. Marcus felt the tentacle pushing deeper. It was the strangest, most awful thing he'd felt. It was so deep inside him now, coiling through every inch of his belly. A shock of heat flooded through his body as it found that same spot the other one had used to make him feel so very good. His eyes bulged in shock as he felt his stiffening dick respond, throbbing hot despite the agony of his stuffed stomach. "Your locus of power is remarkably low down apprentice, in the same region as your prostate. It would have been far easier to find had I gone in the other end. No wonder you responded so strongly to anal stimulation earlier." Mistress clicked her teeth, raising a hand in front of her. "That was the easy part. Now I will send a pulse of my own energy through that part of you, which should shock your powers into awakening."

Marcus felt a cold chill at this talk of shocks. He struggled to move, wanting to scream at her to stop this already. Even if his voice had been working, the tentacle was still stretching his jaw so wide he wouldn't have been able to speak. Silently pleading with his tear-filled gaze, he stared at his new goddess, but she ignored him. Her ruby-red lips were curled in concentration, her purple eyes glowing brighter.

He felt the tentacle twitching, that thick head pressing against his quivering guts. His eyes screwed tight as he waited in agony for what she'd do to him next. There was a strange tingling feeling in his butt, prickles spreading hot over his skin, making his hair stand on end. His dick was aching even hotter now as the tentacle pressed firmer against that place inside him, and he felt a warm drop of pre-cum dribble from the tip.

"Brace yourself, apprentice." Mistress' voice seemed to come from far away. "This might sting a little." White-hot lightning seared through his body from the inside, consuming him in liquid fire. He would have thrashed like an animal in his bonds had he been able to move an inch. As it was, every muscle in his body tensed viciously, spasming that small amount she allowed them to move. His guts heaved, a dry retching around the tentacle that filled up every inch.

Screaming silently in his tortured mind, the young prince slumped into black unconsciousness.