Complex Humanity, a Supergirl fanfic (alien bio, big penis, semi-incest, futa/female)

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Alex had been there for a lot of Kara’s milestones. Her first solar flare; first time swimming; first time at the beach; first rescue; first international rescue; first fight with a lawn mower (the mower won); the first time Kara’d been rejected from a date; Kara’s first actual, awkward date. She expected to be there for Kara’s wedding and first child, however that came about.

What Alex did not expect was to be there for Kara’s first erection.

Kara was an alien and regardless of facial similarities or even limb alignment, Alex knew she was an alien with appropriately alien intimate parts because that was the life they lived and Kara had no clues about boundaries regarding nudity. She had climbed in the tub with Alex and even Eliza and Jeremiah until she was fifteen. The first few times, Jeremiah had been understanding – Eliza had been less so – Alex had shrieked and acted a holy terror. Kara, appropriately chastised, had fled to the attic until the noise and arguing had died down and dinner was made.

She felt a little bad after that. Kara was twelve, and a small twelve at that, and had gotten used to the casual nudity of both Krypton within the Halls and Clark Kent being a bachelor who, when home, lounged around in underwear and nothing else. The Danvers, being neither bachelors or aliens evolved away from overt sexuality, were harder on her. Her little parts would gather attention they didn’t need if she insisted on being naked.

Alex had been curious when a teenager, particularly as a nascent lesbian. She’d only ever seen her own genitals before and even that in the inverted view of a mirror so to suddenly have a floating, naked alien in her room was to invite trouble. Kara slept like the dead and Alex would take a pen light and stare, sometimes sketch or write out, her genitals. She’d stare at Kara’s protrusion – not quite a penis, there was no distinctive corona or glans – and her little sac of three testes-esque parts that dwarfed said protrusion and the fact that Kara didn’t have an asshole, only a urethra, until her eyes burned.

Kara was, she was somewhat ashamed to admit, her very first biological curiosity.

Partly it was that Kara didn’t grow like humans did – Alex had stopped growing at sixteen but at fifteen, Kara still looked twelve. She was embarrassed about the whole thing until she went to swim in the lake by their house after her seventeenth birthday, feeling warm for some reason in December, and her entire skin sloughed off in the water. She went in a cherub and emerged Apollo himself, aged ten years in two hours.

“Of course!” Her father had shouted. “Your growth chambers! I should have paid you more attention, Kar.”

Kara had mumbled something but suddenly being taller than Alex didn’t grant her any more social skills. She had also had The Talk at the same time that Alex had, her cheeks bright red and her eyes darting every which way. She’d explained, haltingly, that she had a child’s genital set and when she reached maturity, it would change. The Danvers had erroneously believed that her new physical changes had led to her sexual maturity.

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It was Sister Night. Every night had been Sister Night since Kara moved to National City and moved in with Alex, but Sister Night was one of the designated times a week they ignored all pressing engagements and just spent time together. Kara had plowed her way through three burritos, five tacos, a case of chicken wings, a giant salad for the micronutrients, a Coke, and was midway through a curry when Alex came back from the bathroom.

She unpaused the episode of Game of Thrones and threw an arm around Kara’s broad shoulders. Kara finished the curry, wiped her mouth, drank a liter bottle of water, and leaned against Alex’s shoulder, snuffling her nose against Alex’s armpit. Alex had been uncomfortable the first few times but Kara loved her natural smell, said it was grounding so she’d toughed it out.

Kara understood, to the barest hint of Alex’s mind, what sex was. It was hard not to on Earth, America in particular. Everything invo

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