When Thor came to the age of a young man he started to notice more. Specifically his brother.
His pale skin, his lean frame. Those sharp cheek bones and green eyes that could see into your very soul.
He thought nothing of it at first. Until he realized the traits he had begun to look for in women, were the same.
This one had green eyes. That one raven black hair. He realized it when he saw the mischievous twinkle in the eyes of the one he was currently speaking with.
He convinced himself it was because they were traits he was familiar with. His brother meant comfort. That was all.
Until it wasn't.
It wasn't uncommon for Thor to wake up hard. So much so he had started sleeping in his own bed more often. Blessedly, when it did happen, Loki hadn't mentioned a thing. Saving them both the embarrassment.
But one morning Thor woke up from a steamy dream that shook him to his very core. It was him, and Loki.
The whole dream was him having sex with his little brother.
He was relieved for a moment to find he wasn't hard, but it didn't last long.
Once he went to move he realized it was because he had already cum. The inside of his underwear was sticky, a small spot seeping through onto the sheet. He immediately shot up and into his bath. Not daring to well on it.
He avoided Loki for days.
Each morning he would wake up from a sex dream, cum in his pants. All because of Loki. He was horrified. Ashamed. What would his father think? His friends?
Loki?
He cried himself to sleep only to orgasm himself awake some mornings.
He could bear it no longer. He had to talk to someone.
There was only one person he could trust to still love him afterwards. His mother.
He broke down while telling her. Not afraid to show that side of himself to her. He explained what was happening and what he felt and feared. She took it all in stride, hugging him as only his mother could. She waited until he was calmed enough before telling him story after story or people she knew in relation with their own kin. Though not openly talked about, it was more common than one realized. He should only worry of he ever felt the need to force himself on his brother. Appalled at the very idea, she was able to qualm all his remaining fear with just a smile. After reassurances that she wouldn't tell a soul, he left with a light heart.
Things went relatively back to normal after that. Until Loki reached his coming of age year. It was only a year previous they had moved to their own rooms permanently, only sharing a bed if one was sick or upset.
During all this Thor had come to terms with his attraction to his brother and despite not being interested in anybody yet, Thor believed Loki wouldn't feel the same for him. Which was fine, Thor loved his brother too much to risk anything.
But he started to notice a few things. Lingering stares, touches, meaningless things that could be full of so much meaning. After a while Thor thought himself crazy and maybe a little too hopeful. And that was all.
Until it changed once again.
One night Thor was returning home from being out late with his friends. As he passed Loki's room he heard something from inside. Afraid his brother was having a nightmare he went inside. He had only taken a few steps in when he realized they weren't sounds of distress, but pleasure.
Thor turned to leave, knowing it would cause Loki embarrassment if woken, when he was stopped dead in his track by Loki's moan.
It was one of intense pleasure, but not only that it was his name.
He was already half hard but when he hears Loki moan his name again he's fully hard in an instant. He doesn't move to leave, too afraid of waking his brother, only turning on the spot to face the bed when he hears him name again.
Luckily Loki's still asleep, but he shouldn't have turned around.
Loki's kicked off his covers, he's laying on his back, thin sleep shirt ridden up to expose his pale stomach.
Thor's eyes hesitate to travel further. It's a big breach of privacy, but as he hears another moan he can't stop himself.
Loki's hard in his underwear, Thor can just make out the outline, the very tip of his brother's member peaking out of the waistband. Thor immediately imagines licking it.
He's achingly hard in his own pants. It takes all his will not to touch himself but he doesn't want to make any sound. So he stands there, dick throbbing, chewing on his bottom lip and watching Loki as he lets out small whimpers.
Occasionally his hips lift a little as if looking for friction and boy does Thor want to give it. But he stays rooted to the spot.
Only a couple more minutes pass before Loki is moaning his name again and Thor watches as his dick twitches and cum spurts onto Loki's exposed stomach. It's almost enough to make Thor cum too but he bites his lip harder, he doesn't trust himself to not make a noise.
After another couple of minutes, these ones filled with silence, Thor finally leaves. Extra careful not to wake his brother.
He practically runs to his own room.
Once there he closes and locks the door. Leaning against it he frees himself, it only takes a couple strokes before he's cumming on the floor with a cry.
While catching his breath he realizes fully that Loki does feel the same attraction he does.
He doesn't sleep that night. He spends the entire night trying to figure out how to approach Loki with this.
As the sun rises he finally has a plan laid out. All he needs is solid reassurance.
And a storm.