The spell has its limits.

You lower your head, momentarily nuzzling Arianna and Lily's gravid bellies, before leaning down to suck on Paphia's milky tits, tasting her sweet fae milk. Once you get her nipples going, you can feel them spurting, splashing liquid into your mouth with rhythmic pulses, as if her breasts pumped milk in time with her heartbeat. Once you pull your lips off of her jutting, stiff nipples with a smack, you can see both of them, sitting atop her melon-sized breasts, small fountains of white liquid shooting a few inches upward to fall back down, coating the fae's mind-bogglingly busty chest with her excretions.

You think back to the event that made you decide to study thaumaturgy in the first place, the accident with your high school classmate Stacey, her tits swollen and lactating, her mind and body overcome with pleasure. That was your goal, wasn't it? To get your hands on some of that fertility magic... and, in doing so, get your hands on some of those fae women.

"Grow for me, Paphia." you command, rocking your hips into her ass, which was swelling along with her breasts, as you plunged your cock, well over a foot long, deep into her womanly folds, filling her to the utmost. "You have to keep feeding that spell."

Paphia, herself, was far too gone into the throes of lust, and far too enamored with the idea of being knocked up, to disobey. Fae women could become quite obedient when it came to a male who was going to give them exactly what they wanted - and needed. Her eyes were wide with the excruciating pleasure of her growing tits and your sensual fucking. Her gigantic teats grew larger, and larger, till they reached about the size of basketballs - but they didn't quite stop there. A faint emerald glow from Paphia's hands indicated that, true to your commands, she was still trying to feed the fertility enchantment changing her body, but it seemed to have an upper limit of size. Instead, her tits became less saggy, more spherical, and the rhythmic spurts of milk from her nipples became more and more powerful, as if the spell was increasing the pressure inside her massive mammaries. A high-pitched cry escaped the dryad's mouth, a helpless whine of one overcome so much by pleasure that it had become almost painful.

Arianna and Lily stared in wide-eyed, lustful shock at the erotic ordeal their sister fae was undergoing, her head cradled on their soft thighs as the dryad's back arched in ecstasy, her hips rolling back into your thrusts. As the spurts of Paphia's milk became more intense, the two fae reached soft hands down to feel her hyperengorged breasts, marveling at their sensitivity, as even in the face of everything she was experiencing Paphia twitched and cooed in response to the lightest caresses of her now magically-sensitized breasts.

"By Titania, this feels amazing and I't's not even happening to me!" remarked Lily, the mermaid giggling slightly as she was transfixed by the erotic spectacle before her. The two fae girls could not take their eyes off of the act of breeding in front of them, the seemingly hypnotic pull of your cock and their own desires keeping their attention locked, their mouths open in amazement.

Full of the need to breed and seed the gorgeous fae writing in pleasure beneath you, you reach your firm grip down to grasp at Paphia's hips, holding her tight against you as you thrust deep inside her, your seed finally letting loose as her pussy writhes and clenches around your huge, prehensile shaft in another orgasm. Your balls twitch as spurt after spurt of thick, fertile cum shoots inside her waiting, ready womb. The dryad's breasts, seemingly with the power of a sprinkler, spurted successive shots of milk, splashing the walls, you, Lily, Arianna, and a bit of the ceiling with her milk as she wailed in orgasmic ecstasy. For long moment after moment, you continue to full her belly with your seed, the pleasure finally subsiding some time later.

Breathing slightly heavily, you come to, having not been so much **** as in a lust-filled haze, looking at the amazed faces of Lily and Arianna as the three of you kneel around Paphia's prone body, your cock still hard and ready, deep inside her.

"Wow. That was... something else, stud." winks Arianna, obviously having enjoyed the show, rubbing her own bloated belly.

You smile at her appreciation, then look down at Paphia, seeing her eyes start to become less glassy, like she's becoming aware of her surroundings once more.