The Unforgivable Desire

The autumn wind howled through the ancient corridors of Hogwarts, carrying with it the scent of rain and decay. Harry Potter stood at the entrance to the Great Hall, his eyes fixed on the enchanted ceiling that mirrored the turbulent sky outside. It was the start of his fourth year, but his mind was far from the Sorting Ceremony or the upcoming Triwizard Tournament. His thoughts were consumed by the man who had turned his world upside down over the summer: Sirius Black.

When Harry had first met his godfather in the Shrieking Shack the previous year, he had expected to feel a familial bond—a connection to his parents, a father figure to fill the void that had haunted him since infancy. Instead, what he felt was a rush of heat that had nothing to do with parental affection. Sirius's gaunt but handsome face, his wild dark hair, and the dangerous glint in his grey eyes had ignited something primal within Harry. He had blushed, stuttered, and nearly dropped his wand when Sirius had hugged him. At the time, he had dismissed it as nerves from the chaos surrounding them, but as the summer unfolded at Number Twelve, Grimmauld Place, the truth became impossible to ignore.

Harry was in love—or something darker, more obsessive—with his own godfather.

The realization was a constant, gnawing guilt. What would his father, James Potter, say if he knew his son harbored such feelings for his best friend, a man twice Harry's age? Harry would lie awake at night in his dusty bedroom at the Black manor, staring at the canopy and imagining James's disappointed eyes. He tried to reason with himself: Sirius was meant to be a parent, a protector. But whenever Sirius entered a room, all rational thought fled. Harry became clumsy, dropping goblets and tripping over rugs. His cheeks would burn, and he'd stammer like a fool. Sirius, for his part, seemed oblivious, treating Harry with the casual affection of a guardian—ruffling his hair, offering gruff advice, and sharing stories of the Marauders. But every touch, every smile, sent Harry's heart racing.

The summer nights were the worst. Grimmauld Place was a gloomy, oppressive house, filled with shrieking portraits and the stale air of old magic. Sirius, still a fugitive and confined to the property, often drowned his demons in firewhiskey and the company of strangers. Harry would hear the creak of the front door late at night, followed by the murmur of voices—low, flirtatious laughter that made his stomach clench. He'd peek through the banisters and see them: women, sometimes men, with painted faces and hungry eyes. Prostitutes, Harry realized, brought in to satisfy the needs Sirius couldn't quell after twelve years in Azkaban. The jealousy was a physical pain, a burning in his chest that left him moody and irritable. He'd snap at Ron and Hermione in his letters, then feel wretched for it.

One particularly cold evening in early September, just before the start of term, Harry made a decision. He had spent the day watching Sirius flirt with a witch with violet hair, her giggle like nails on a chalkboard. That night, as the house settled into its usual creaking silence, Harry prepared a platter with a glass of firewhiskey—the way Sirius liked it—and made his way to the master bedroom. His heart pounded with a mixture of terror and reckless determination. He had worn his best shirt, one that Hermione had once said brought out the green of his eyes, and run his fingers through his hair in a futile attempt to tame it.

The door to Sirius's room was ajar, and candlelight flickered within. Harry pushed it open silently. Sirius stood by the window, staring out at the rain-slicked street, his back to the door. He wore only trousers and an unbuttoned shirt, revealing the tapestry of scars and tattoos across his chest. The sight made Harry's mouth dry.

"I told you, Kreacher, I don't want—" Sirius began, turning with a tired smile. When he saw it was Harry, the smile shifted into something more genuine but weary. "Harry. What are you doing up? You've got the Hogwarts Express tomorrow."

Harry set the platter on a side table, his hands trembling. "I brought you a drink," he said, his voice steadier than he felt.

Sirius raised an eyebrow. "That's... thoughtful, but you should be in bed." He gestured towards the door. "I'm expecting company tonight. Special company." The words were kind but dismissive, and that stung more than any insult.

Instead of leaving, Harry took a step closer. Then another. His heart was a frantic drumbeat. "What if..." He swallowed hard, his throat tight. "What if I was your snack for the night?"

The question hung in the air like a curse. Sirius's grey eyes widened, a storm of confusion and dawning horror swirling within them. "Harry, you don't know what you're saying. I'm your godfather. This isn't—"

But Harry didn't let him finish. He closed the distance and slid onto Sirius's lap, wrapping his arms around the older man's neck. The contact was electric, sending shivers down his spine. Sirius's body was tense beneath him, his hands hovering near Harry's waist as if afraid to touch. "I know what I want," Harry whispered, pressing his forehead to Sirius's. "I've wanted it for months. I can't stop thinking about you."

Sirius made a choked sound, half-moan, half-protest. "Prongslet..." The old nickname for Harry's father slipped out, and something inside Sirius seemed to snap. His hands finally gripped Harry's hips, fingers digging in almost painfully. "This is wrong. James would—"

"I don't care," Harry breathed, and then their mouths met.

The kiss was desperate, hungry, all teeth and tongue. Sirius tasted of firewhiskey and something wilder, like the night itself. Harry moaned into it, surrendering to the sensation of being wanted in this forbidden way. Sirius's hands roamed over his back, pulling him closer, and Harry could feel the hard evidence of Sirius's arousal pressing against him. He rocked his hips instinctively, drawing a groan from deep within Sirius's chest.

Sirius broke the kiss to trail his lips down Harry's neck, sucking at the sensitive skin below his ear. "You're so young," he murmured against Harry's pulse point, his voice wrecked. "So beautiful. It's not fair."

"Please," Harry gasped, tilting his head to give Sirius better access. "Please don't stop."

Sirius didn't stop. He laid Harry back on the bed, covering him with his body, and continued his assault on Harry's senses. Shirts were torn away, skin bared to the cool air. Sirius's mouth worshipped every inch of Harry's chest, murmuring endearments that were half-mad: "My Prongslet, so perfect, mine." Harry writhed beneath him, making noises he couldn't control—soft whimpers and louder cries that echoed in the old room. This was what he had craved, the intimacy he had imagined in his darkest fantasies. It was overwhelming, consuming, and utterly wrong.

Afterward, they lay tangled in the sheets, the fire burned down to embers. Harry was drowsy, his body aching pleasantly. Sirius held him close, but his expression was troubled. "We can't do this again," he said, his voice rough. "When you go back to Hogwarts, you need to forget this ever happened. I'm a menace, Harry. Azkaban broke something in me. You deserve someone whole, someone your own age."

But Harry just pressed closer, unwilling to let go. He didn't care about age or sanity. All he knew was that for the first time in his life, he felt truly alive.

The return to Hogwarts was a cruel awakening. Harry walked the familiar halls in a daze, his mind constantly drifting back to that night. He became even more withdrawn, snapping at friends and teachers alike. Ron and Hermione exchanged worried glances, but Harry couldn't explain. The Triwizard Tournament became a blur of danger, and the looming threat of Voldemort felt distant compared to the turmoil inside him.

It was Severus Snape who finally confronted him. Harry had been avoiding everyone, spending his free time in shadowy corners of the library, when Snape materialized from the darkness like a vengeful spectre. His black eyes bored into Harry with an intensity that was unnerving.

"Potter," Snape said, his voice a low drawl. "Your performance in Potions has been more abysmal than usual. And your demeanor suggests... a distraction."

Harry bristled. "What I do outside of class is none of your business."

Snape's lip curled. "When it reeks of the same self-destructive foolishness your father displayed, it becomes my business. I know about your... involvement with Black."

Harry's blood ran cold. "How—"

"The walls of Grimmauld Place have ears, and I have my sources," Snape said coldly. "I've watched you, Potter, sulking like a lovesick child. Do you think this is some grand romance? Black is a broken man, using you to fill a void left by your father. And you—you are a boy playing with fire that will consume you."

"It's not like that!" Harry's voice rose, drawing a stern look from Madam Pince.

"Isn't it?" Snape stepped closer, his voice dropping to a venomous whisper. "You deserve someone your own age, someone who can offer you a future, not a fugitive twice your age with a death wish. Your father would be ashamed."

That last sentence hit like a bludger. Harry flinched, and Snape's eyes glittered with cruel satisfaction. But then, something shifted in the Potions Master's expression—a flicker of genuine concern, perhaps, buried under layers of bitterness.

"I am not your enemy in this, Potter," Snape said, his tone marginally softer. "End this infatuation before it destroys you both. The Dark Lord is returning, and we need you focused. Not pining over a man who can never give you what you truly need."

Harry wanted to argue, to defend Sirius, but the words died on his lips. Deep down, a part of him knew Snape was right. The guilt, the jealousy, the constant ache—it was eating him alive. And yet, when he thought of Sirius's touch, his whispered "Prongslet", he couldn't regret it.

That night, Harry sat alone in the Gryffindor common room, staring into the dying fire. The shadows danced on the walls, mocking him. He thought of Sirius, alone in that dark house, and his heart twisted. He thought of his father, and the shame was a physical weight. He thought of Snape's words, and for the first time, he considered the possibility of letting go.

But love—or whatever this was—was not so easily dismissed. It clung to him like a curse, dark and unrelenting. And Harry, the boy who had faced monsters and lived, found himself utterly powerless against his own heart.