Leo took a deep breath, trying to calm himself in front of his new companion, but it was useless. Nigredo was pumping a lot of nasty chemicals inside him to make the boy get rock hard, something that could pass as a normal reaction.
"I . . . I am . . . sorry . . . It never happened to me . . ." the redhead muttered while looking at that throbbing mass of virility with veins like roads in a map.
"Oh, don't be shy, darling! I know each inch of you! I even gave you this great cock as a little present. You humans love having big dicks, right? And sex . . . that will make us the best partners ever!" The alien cheered him up. All while making sure to mess with his inner chemistry enough to make him extremely horny, nothing more, nothing else for now.
He raised an eyebrow, his hands on his side, trying to avoid that need to jerk that massive bitch breaker. The idea that she could change his body to that degree crossed his head for a second, and he felt a little bit weird for this specific improvement. "Why, you said that?" He asked, trying to change the topic.
"I don't eat normal food; I feed on a specific set of hormones, mostly adrenaline . . . and a little bit of serotonin, and luckily for your species, that is produced in great quantities during your most favorite activities! Fighting and fucking!" The goo tentacle added, and then two tiny tendrils made a pair of finger guns that she "shot" toward Leo.
"I . . . well, I fight a lot but not so much . . . the second one," he answered with a nervous laugh. The hero knew a bunch of girls, and even some of his female villains were on the teasing side. However, he didn't want to choose one, as getting a girlfriend could make the rest of his friends leave him or, worse, choose another man. It was a shitty thing that Leo did, but deep down . . . he hated the idea of seeing them having romantic interest in other people.
The shame and guilt from having such dark feelings kept him from consuming an intimate relationship. He didn't want to be a shitty boyfriend and ruin his friend's life.
"And it is a shame! With so many female friends and enemies you have . . . you should be spreading your genes far and wide," Nigredo suggested with a cheeky smile, slowly pushing him to do what she wanted. There was nothing hotter for the alien than seeing the man she loved having sex with other women.
He blushed; the idea was just too tempting once he saw the outlook, but the boy quickly shook his head. "It is not that easy! I am, you know . . . shy . . . I don't want to have to choose a friend to be my girlfriend; that just feels weird," Leo refuted the alien suggestion.
"Oh, that is easy; just pick them all. I know you are familiar with the concept of a harem," she added, and then a thin black tendril pointed to under his bed. The hidden collection of unsavory porn videos and other media that he had stashed far away from view.
"That is just fiction; that doesn't happen in real life, and polyamorous couples are super complex and not something I am interested in doing. I . . . dislike the idea of sharing," he confessed, and then Nigredo gave her a perfect solution for all his ills.
"You have the right idea, just need a little push; let Momma take care of you," she muttered, and then the tentacle of goo changed.
It jumped in front of him and began to become bigger and bigger, turning into a massive woman still connected to Leo by strands of black ooze. Long and thin enough so they would not get in the way as the alien took a perfect shape for him.
She was tall, at least two heads taller than Leo, and clearly a woman, not only for the massive size of the black tits but also for those wide childbearing hips. Made of pure dark and wet goo imitating flesh, white details covered both her nipples and crotch as mockery of underwear, while the rest decorated her skin with long lines like tribal tattoos. She was even extremely fit with visible abs and thick arms and legs. Her face hypnotic, the big maw of white teeth was still there but now attached to a face with two big white goo pools as eyes and multiple ebony tentacles cascading down as if they were hair.
"There we go, better!" The slime girl exclaimed while touching the tits that were the size of Leon's head with her big hands.
("It never gets old seeing his reaction to seeing me like this for the first time . . . I can't wait any longer . . .") Nigredo thought with her own desires of showing him her love, always on the verge of ruining her plans during this stage.
Leo's body froze as his cock got so hard that a single bead of precum came out of his tip. "You can do that?!" He yelled, looking at what was basically his ideal type of woman but more on the . . . alien goo eldritch side. Not like something like that mattered for a freak like him.
"Don't worry, I am really, really weak in this form, so you can easily overpower me . . . honestly, I am mostly a huge sex doll if you think about it . . . one made exactly for your preferences . . ." she muttered and then got closer to him, leaning down and pressing, touching his face.
"Well, it's not like I want to fight you. . ." he added, unable to fight back even if he wanted to. The boy was too horny and too nervous, like a deer about to get hit by a truck. She smelled so good; it was strong, chemical, and sweet. It was like fresh gasoline fumes but without the toxic aftertaste that made a part of your brain tell you that there was something wrong.
"You masturbate to a lot of rape porn, forceful impregnation, corruption, body modifications . . . really fucked-up stuff. Not the kind of stuff that a hero should be jerking their cock to, right? Especially as shy and cute as you," Nigredo said, taking a step forward and then placing that massive cock between her thighs, becoming the first woman to touch his genitals.
A moan was all the opening she needed to attack. "I like it," she confessed and then stole Leo's first kiss.