She gives him a boost, a big one

"Something to help you keep going," Adiane said, immediately sinking her fangs into Phineas' slim pec, injecting him with a powerful dose of the virus with the intention of making him cum buckets. He felt the effects almost instantly, tremors running through his body and balls tripling in size.

"Oh fuck, what did you do to me?" he gasped, doubling over as the pressure in his testicles increased nearly to the point of pain.

"Better question is what are you doing to do to me?" Adiane said, pushing her large chest out to be within easy reach of the changing man.

"I'm...gonna...fuck those fat titties!" Phineas exclaimed, hands reaching out to grab a handful of soft tit flesh. He immediately thrust his aching cock into the tight valley of cleavage, precum flowing steadily from his cock. He barely got three thrusts in before his balls were clenching, sending wave after wave of cum down his dick. White goo shot from his sensitized tip, splattering against Adiane's chest and neck, a few powerful shots even landing on her face. In moments, she was covered in cum, but Phineas' flow didn't stop. Instead, his shots only got more powerful as his cock grew four inches, nearly big enough to escape the crushing valley of the drider's boobs.

"Yes, cum! Paint me with your pearly seed!" she moaned, the pleasure of having her boobs roughly fucked combining with the steady sensations of her eggs easing into Tivana's stuffed womb. Once her latest batch of eggs was safely deposited, Adiane withdrew her ovipositor, leaving her former boss with a bump like woman 6 months pregnant. The brunette beneath her was rapidly recovering from her paralysis, but the pleasure of the virus and being impregnated overrunning her mind kept her writhing on the floor, pinching her tits as the silicone inside them changed into real, tender flesh.

"Now, I think that's enough cum to share, don't you?" Adiane cooed, jerking Phineas' still firing cock as it continued to rain sticky white fluid down on her. She turned Phineas slightly, pointing his large cock at their watching coworkers. "Go on, share it with them." Phineas was too absorbed in the never ending sensation of cumming to care were his dick was pointing. He could only eagerly push another massive load out of his constantly refilling testicles, splattering the crowd with his jizz.

Already enraptured by the perverse display in front of them, the virus had no trouble infecting them all swiftly. All around the room, people went from business casual to naked and panting, hands meeting expanding flesh as transformations ripped through them. Adiane watched as her coworkers joined her in lust-fueled madness, before looking down at the moaning woman beneath her.

"And how is my broodmother doing? Feeling nice and full?" Tivana twisted and moaned, still fighting against her body's joy at being filled with the drider's young. Adiane leaned down to speak to her more easily over the growing noise in the office, their matching bouncing breasts pressing against each other. "Would you like to know the best part? Those eggs you're full with aren't fertilized. So you have two options. You can keep them in there forever, or you can go hop on one of those hunks' cock and let them bathe my eggs in their seed. Your choice." Adiane stroked her former boss' face with a clawed hand before leaving her to struggle with herself, scuttling over to another thrashing woman and shoving her ovipositor down her throat, eager to fill another with her children.

Tivana struggled with the new weight of her belly and breasts, both heavier and larger than she was used to, before finally managing to flip herself over onto her hands and knees. She watched as the orgy surrounding her intensified, her subordinates losing themselves to the mad desire that consumed them. At least, they had been her subordinates. She could hardly imagine standing up at the moment, much less command any semblance of respect. Worse, the stretching of her womb felt incredible, sick satisfaction filling her with every slight shift of the eggs. She loved the feeling, despite herself.

Across the room, Tivana could see Martin, one of the company's oldest employees, balls deep in her assistant Patty, a woman in her fifties, both of them becoming younger by the second. The lines on their faces disappeared, flesh becoming firm and supple, better than it had ever been. Martin grunted and shouted as his reinvigorated cock, unable to stand a few minutes ago, shot wave after wave of potent seed into the plump ass of Patty, now a sexy brunette bombshell.

Her stomach swelled as gallons of cum filled it, until it was larger than Tivana's own. An irrational sense of jealousy filled her. She wanted to look like that. No, wait, she dreaded looking like that. She didn't want a stomach full of cum, she wanted a womb full of it. A womb full of cum so that she could birth a swarm of little spider babies. More than one, preferably.

She crawled slowly towards the mass of fully infected people, the throbbing in her mind and belly becoming an irresistible pull. She needed cum, desperately. She needed it to coat the eggs inside her, to fertilize them. To make her swell as they grew. And they would. She'd make sure of it.

"Don't you all hate me? Slutting around in front of you all? That's right, you all knew it. I was fucking anyone I could, just to get away from all you useless idiots. I hate you all so much, you're all so fucking useless, I'd fucking fire you all if I could. Just like that bitch Adiane." She continued her mad tirade, shouting all manner of incomprehensible insults at the people surrounding her, until finally someone noticed.

Sophia, formerly a mousy Italian girl with messy brown hair, walked up to her, her new plump hips swaying and luscious tits bouncing, her complexion a beautiful olive tone. She would have looked like a Latin queen if it wasn't for the heavy cock throbbing between her legs.

"You whore!" she screamed, anger and desire driving her in equal parts. "I put up with you for so long, all your bullshit! I'm going to show you what a real bitch looks like; you'll see her every time you look in the mirror!" The infuriated Italian woman swiftly plunged her boss full of her new cock, only remaining in control long enough to slap the woman's fat ass before taking up a furious pace, the stimulation around her new appendage driving her to reach her first orgasm with it.

"Fuck fuck fuck, you really are a whore, cause this pussy is amazing! I can feel it, I'm gonna--AH, I'M CUMMING!! OOOH YES!!" the futa screamed, sperm flooding out her twitching tip to fill her boss, who was moaning with her. The warm splash of seed inside her, combined with the knowledge that the many eggs inside her were soaking that seed up, ready to begin growing, was enough to drive her to her climax several times over. Tivana continued to buck and thrash on the floor long after Sophia had abandoned her for another pussy. She couldn't wait for her full womb to swell with Adiane's children.