Aerglo finds humans... interesting.

They sleep for hours on end or not at all. They get colder much faster and vibrate when they do ("We shiver," Caelum explains with a little snort of amusement). Not to mention that they "sneeze". It's completely involuntary and sometimes almost violent, but completely adorable. Especially so when Caelum gets frustrated and his cheeks tinge red (another odd feat that intrigues xem).

Xe has never taken much interest in humans before and of course xe has learned some about them, along with all the life outside xyr planet, but experiencing the small quirks xyr eno elttil has is new and fascinating.

Xe especially likes when small bruises form on xyr eno elttil when xe kisses and sucks the smooth skin, ripping small moans and gasps from kiss swollen lips.

Xe enjoys those little sounds of pleasure, but what xe enjoys most is Caelum's happiness.

The human tugs xem along toward the back of the house and to the backyard.

There are little flowers dying from the cold Autumn air and dewy frost that covers them each morning.

But there's something more peculiar than anything xe has ever seen before.

Dancing lights.

Xe reaches out, flinching as a small creature lands on xyr hand and lights up.

"Fireflies," Caelum whispers, a little bug on the tips of his own fingers, "it's getting colder so we don't seem them that much anymore, but in the summer there's hundreds of them flying and lighting up."

Xe stares at Caelum in surprise, admiring the look of nostalgia on the human's face.

"Fire... flies? As in a flame that floats?"

Caelum giggles, "No, as in little bugs that light up in order to attract mates. I guess you can say this is their way of courting."

"Interesting," Aerglo hums.

"Yeah," xyr eno elttil agrees, breathing deeply.

Aerglo releases the small specimen and wraps xyr arm around Caelum, pulling him closer into xyr warmth as he shivers.

"Are you alright?" Xe asks.

Caelum nods, "yeah, I'm okay, it's just a little chilly."

Aerglo has no problem sharing xyr warmth with Caelum, and xe only tightens xyr protective hold on him to keep the cold at bay.

Caelum snuggles against xem contently, eyes wandering to the night sky and a sadness clouds his eyes. It takes a while for Aerglo to figure out why, but xe feels the way the newly formed scar tissue pulls as xe stretches xyr arm.

Xe is almost completely healed, the traces of poison circulating in xyr system slowly disappearing. Day by day xe regains a bit of xyr strength back and xe knows xe'll have to leave soon.

Too soon.

So, when they get back inside and cuddle in bed, xe doesn't stop the little human from straddling xem. Their languid kisses turn heated, bodies pressed flush together and those little sound that drive xem crazy fall from Caelum's plump lips.

Caelum is scared and nervous, he's never been with anyone. His only relief has been his hand and fingers.

"More," he whimpers, back arching, "please."

Aerglo hesitates.

Humans are fragile and more delicate, it's in the back of xyr mind that xe could hurt Caelum so easily and it's slightly terrifying.

But Caelum is placing his trust in xem. His lithe body begging to be touched.

Weeks of hiding their attraction for each other, weeks of holding back, surface like a flooding dam.

And Aerglo knows Caelum is xyrs. Xe can feel the way the younger's heart beats in sync with xyrs.

It's exhilarating.

But xe needs to be sure.

"Caelum," Aerglo breathes, panting against the boy's ear huskily.

"Hm?"

"I need to make sure," xe begins, "that this is what you want."

Caelum stops grinding his hips against Aerglo's, and breathlessly looks into the alien's eyes.

"If we mate," Aerglo warns, "we do so for life. You will be mine, as I will be yours. Even if we're stars away, I will always be with, I will always find you. This bond will not be severed easily, and you will always carry me in your heart but only if you wish so."

The younger boy bites his bottom lip, "I want to carry you in my heart. I want to feel my heart beat faster at the thought of you. I want to wake up beside you. I want to be with you. I want to know who you are and be your mate. I want to be yours."

"Even if I part?" Aerglo asks, "if I leave with my comrades?"

"I'll wait for you," Caelum whispers reassuringly, "always, even if you don't come back and even if you forget me. I'll be yours."

Aerglo's hands rest on slim hips before giving in.

Xe devours Caelum completely, feels the tight heat surround xyr aching cock as it's sheathed inside the boy. Xyr little one takes it all, he whimpers and moans and cries.

And xe tries to hold back as xe thrusts inside the boy's warmth.

Caelum melts into the pleasure, letting their bodies rock together until a choked yelp falls from his throat. Aerglo groans, burying xemself to the hilt.

"Ow," Caelum whimpers at the sudden building pressure in his entrance.

"I am sorry," Aerglo grunts.

"Wha-What is that?" Caelum pants, hips still canting.

"We live a long time," Aerglo huffs, "nearly a thousand years, so procreation is difficult. Our biology has given us a helping hand in which the base of the shaft expands to lock us inside our partner to ensure conception."

Caelum stares at the alien, at his mate, in a daze and he wonders if the pleasure hasn't completely overwhelmed his thinking, "as in a baby?"

Aerglo nods, cheeks aflame, "It's always difficult to conceive regardless of our biology. And it'll be even more so with us being so... different. To be honest, no one from my home planet has ever interbred with another species and with male humans, it's improbable to ever conceive because the equipment is rather lacking."

Caelum frowns arms wrapping around the alien as xyr hands cup his swelling belly full of xem, "and you're okay with that? Mating with someone who can never give you a... a baby?"

"If you are my mate," the alien smiles, nuzzling his neck, "I don't care if I never become a sire."

Before Caelum can argue and stop xem, Aerglo bites the juncture of his neck and shoulder as xe continues to pulse and spill inside. Oddly, the pain pushes him over the brink of another orgasm and everything whites out for a split moment.

He feels hot, body aching and sweaty and heart beating fast inside his rib cage. His heart beating to the strong rhythm of the alien's, of his mate's.

"With this," Aerglo mumbles, licking a dribble of blood, "I seal my promise to love you and only you."