Stay with me.
Ever since they had confessed to each other of their feelings, Thor had been enjoying each night with his brother. His beautiful brother, who he had always longed and loved, finally back to him after those long five years when Thanos snapped Loki into dust. Now, Thor had Loki back and he never wanted to let go again, especially after they started their... nightly activities.
But something was off with his brother. Perhaps Thor was a little slow on thinking and planning things, as Loki often pointed out, but he had watched his brother for their whole lives. He couldn't miss the way his brother was, both in bed and out; Loki seemed a little too emotional, determined in making Thor enjoy himself and everyone else enjoy themselves too. Something had taken Loki's deviousness, his wittiness and cockiness that Thor had adored.
Loki was sitting on his cock now, and Thor's mind was almost lost with the sensation of being inside his little brother's ass. He steadied his breath; tonight, tonight he must confront Loki.
"Loki," He started, trying not to pant, "Brother, what's troubling you?"
Loki turned to look at him with those beautiful emerald eyes, yet Thor could barely see any true joy reflected in them; a ghost of a smile tugged at those thin lips, making Loki's face look like a mask. "Nothing." Loki said, then moved again, riding Thor's cock, moaning out his name. Thor was almost tempted to forget the thoughts in his mind and just take his little brother and fuck deep into him... almost. Instead, he held his brother in place. "Loki..." Thor tried again.
"What? Do you not wish to have me tonight? Is that what it is?" Loki whirled on him, a whining desperation not just of lust but of genuine sadness in his tone. "No, it's not-" "Then have me, ride me hard and make it hurt, be rough with me, brother, please!" Loki was begging him, throwing his head back in what would've appeared to be ecstasy, but Thor was getting better at looking past the disguise; he heard a tremble in Loki's tone. He cannot let this go. "Loki, what's wrong?" "Sentimental, brother? I should be asking what's wrong with you! Don't you want me? Are you not desiring me?" "Yes, but-" "Then have me, have me now and let us both immerse in this pleasure! I know you want to ruin me, I know your cock can destroy my hole and make me sore and in pain for weeks and weeks, just do it! Have your pleasure with me and stop asking-" Words were rushing out of Loki, and Thor was growing ever more concerned. It isn't normal for his brother to be so- Thor would've imagined that even if Loki did enjoy rough sex, he would not be one to give in so, to be so wanton for pain. This Loki was not alright. He had to figure out why his brother was hurting. "Loki," his decisive tone put a stopper to his brother's babbling, "I don't wish to take advantage of you in this state. What's wrong?" Loki looked down, not saying a word. Thor's brow creased; for good measure, he added: "I won't help you to release until you do tell me what troubles you, brother."
There was silence, as Thor felt Loki's breath become shallow on his chest. He stroked Loki's raven locks with his fingers. His brother, god of mischief, who manages magic beyond Thor's comprehension, was but a child when Thor looks down on him in this way.
Suddenly, Loki leaned into him, press his forehead into Thor's shoulder. Instinctively, Thor put an arm around him, and at that Loki begun to tremble and sniffle, the beginning of a sob. Soon, Thor felt cool, streaming tears where Loki rested his face and looked down in utter alarm. A terrible thought occurred to him; could it be, could it... "Loki," He begun, now tentative in every word, "Do you not want this? This... what we are doing now? Do you not want me in... in this way? Have I coerced you into doing this act? Are you merely seeking to please me with this?" He wanted to hold his sobbing brother tight, but he dared not now, afraid that Loki would shrink away from his touch.
"N-no..." Loki's small voice came, and Thor breathed a sigh of relief. "Brother, then tell me what it is that makes you despair so." He lifted Loki's chin with his fingers, and the sight of his brother's tear stricken expression and slightly puffy eyes made Thor's relief vanish in the instant. "B-but Thor, I deserve this... this guilt..." Loki mumbled. "No, Loki, you don't!" Thor was appalled that Loki thought he deserved such pain, and would say it with such anguish, "Even if the world, even if you think you do deserve whatever it is, I will not for a second believe that you do."
Silence fell again, as Thor caught Loki's desperate gaze. Loki looked like a lost child, searching in Thor's face. Finally, he let out a small breath, the pain still evident behind his eyes, and said, "I'm sorry, brother. I... I just... I still feel responsible, for... for what I did in New York... for..." and Loki's breathing was ragged again, and Thor waited but dared not to interrupt his brother. "For all that I did, for all the things I destroyed and all the people I've killed, all the families and lovers I've broken apart with my delusional greed...!" at that, Loki buried his face in Thor's shoulder again, and wept freely, choking out loud sobs. Thor held him tightly; he could not believe that, for all this time, his little brother still suffered. A fist clenched in his free hand. If Stark hadn't snapped out Thanos already, Thor would be finding him and punching the monster until there was a gaping hole in his stomach, for doing this to Loki, to his little brother.
When Loki had quieted down a bit, Thor gently lifted his brother from his shoulder and looked at him. "Loki," he spoke, voice was as soft as it could be, "You were manipulated, controlled by Thanos. You didn't know..." "But I did! I... I had wanted to and that's why Thanos could use me, that's why I could kill, because he just brought out the worst in me that was already there... It was me..." Loki looked away, not meeting Thor's eyes, "I did know and I was the one who-" "Loki, you were manipulated," Thor cut him off, not wanting his brother to blame himself again, "You were controlled, your mind was not yours, Thanos is persuasive and powerful and you are a victim who fell to his persuasions, his words. It's not you. I forgive you, all of us do and I'm sure if the people of New York knew the whole story, they would, too."
"They would?" Loki looked up to him with pained eyes. "They would," Thor promised, "So all that's left is yourself. My brother," and at that he kissed Loki deeply, hoping that he showed his affection and love and that it would warm his little brother, "please," another kiss, slower than before, "forgive yourself, as you should." He held Loki's face in his hands, and watched as his brother melted under his touch, tearing up again, but Thor could see the light returning to them, and he smiled, and Loki smiled, weakly, too. "I... I think I do... then.. forgive myself," he said, quietly, and Thor heard sincerity despite the quiet tone. Then, Loki kissed him again, a kiss burning with unspoken love and desire. When they pulled apart again, Thor looked at his brother, and he saw the former smirk he had been missing for so long return to Loki's face. "Now, brother mine," Loki's voice was slightly thick with lust, "now that we are past all the talk, is it not time for some physical love and pleasure? Afterall, a polite prince should know to express his gratitude clearly."
And on that word, Loki rode him, slowly now, with passion and pleasure and they moaned together, skin against skin. Thor's head felt giddy with lust and pleasure and the love, the love he feels for his brother and he leaned up for a kiss, and felt Loki's smirking lips against his own as they moved in rhythm. Soon, he felt his cock begun to twitch and jerk in anticipation of a strong orgasm, and he felt Loki's muscles begin clenching him tight, and he knew his brother was close as well. Together, they climaxed, Loki shooting ropes of white across their chests and Thor shooting his seed deep into Loki's warm, tight hole. Feeling whole with his brother's mess inside, Loki moaned once more quietly, and the two fell asleep still entangled.