This story has both a one-sided Grayson x Drake and Herobrine x Grayson. Really, it's actually more Grayson x Drake, in the beginning at least. I am very conflicted rather I should make a part two or not...
In case you haven't noticed, I might have an obsession with Drakebrine. I just love possessed characters!
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The ex-commander stood in the mountain top home of the hybrid, looking down as the waves crashed against the rocks, the aroma of the ocean water filling his nostrils. The sun was setting beyond the horizon, the air beginning to become chilly as night slowly fell on the land. Grayson shivered, rubbing his arm from the cold. It always got cold by the time dusk set. He took in a deep breath, a smile on his face.

  "Hey, Grayson!"

Grayson turned around, facing the hybrid. He approached him, his black and brown hair flowing in the cool breeze. His Enderman eye and white eye both had a slight beautiful glow to them, Ender particles flowing slowly around his body. He had a large smile on his face, a chuckle leaving his throat.
Grayson's smile widened, his cheeks getting red. He loved having Drake around; everything about him he adored. He was intelligent, collected, kind, helpful. He loved him, but he could never get himself to confess to Drake face to face. He didn't want to be rejected and ruin the relationship they already had.

  "What's up, man?" He said, his cheeks flush and heart racing. At least he was good at hiding abnormal behavior around his crush.

Drake spoke, yawning as he stretched his arms. "I'm going to try to get some rest. We have a long day ahead of-"

Grayson gasped when his friend suddenly let out a cry. The hybrid fell to his knees, holding his head in pain. The blonde ran to Drake, holding him underneath his arms to pull him up to his feet. He hated seeing his love in pain.

  "Drake! Are you okay? You're still having headaches?" He said in concern, holding back the urge to wipe away his tears of pain.

Drake stood, rubbing his head as the pain faded. "Yeah. They've been getting worse lately."

He pulled away from Grayson, continuing to rub his aching head. He forced up a small chuckle. "Ow. That hurt."

  "I'll get you a water bottle!" Grayson said, searching through his backpack until he grabbed a full glass bottle.

He pulled it out, handing it to Drake with sweaty hands. He was glad that Drake didn't notice his body sweating and the blush on his face. It felt good to move on from his deceased wife, even if his new love interest was a guy...
The Mage thanked him, opening the bottle and chugging down it's contents. He pulled it away from his lips, closing it before he handed it back to Grayson. The ex-commander took it, putting it it back into his backpack, but he never ripped his gaze from his secret love.
He scratched the back of his neck, his heart racing. He wanted to confess. Tell him, don't tell him. What if he did feel the same? What if he didn't?
He looked away from Drake, his feelings making his face burn and chest ache. He wondered why now of all times he was beginning to feel these symptoms of love that he was usually so good at hiding. How much longer could he keep his emotions bottled up inside?

  "Drake, I...uh..." He choked on his words.

Drake turned to him with a coo. Grayson looked back up at him, his friend being able to tower over him. He looked so adorable! Grayson shook his head, trying to get rid of the thoughts. He swallowed a lump in his throat.

  "I'll help you g-get to bed!" He stuttered, not actually saying what he had wanted to say. "I-I don't want you to fall or anything, you know?"

Drake agreed to let Grayson help him. The blonde put the hybrid's arm over his neck, and began to lead him to his room. They walked up the few steps, before going into the temple like building, and headed over to the bed with crimson red blankets.
Drake laid down, putting the covers over himself. His face looked calm, yet had a pain filled gaze in his eyes. Grayson hated that. He listened as the hybrid let out a deep breath and closed his beautiful mis-matched eyes.

  "Good night, Grayson." He said with a low voice, as if trying to hide the pain he was in.

  "'Night Drake." Grayson said, taking a step back.

He waited until the hybrid began to lightly snore, which didn't take long at all. He smiled down at Drake, amused by the small noises he made in his sleep. So cute! He let out a sight, before turning around to go sleep in Drake's study.

  "Love ya." Grayson sighed, mentally beating himself for not not manning up and telling Drake the truth.
...

Grayson slept soundly in the old, stone room. It was cold in there, but he had warmth underneath the white covers of the bed in the south-western corner. There were no windows, letting the cold air drift into the room.
Grayson shivered in his sleep, but the cold wasn't what woke him up from his slumber. He laid there only half asleep, able to feel the bed underneath him, but his dream continued to play before his closed eye. He had an eerie feeling. Something wasn't right.
His eyes shot open, hearing the creaking of the old door. Grayson sat up straight, holding his sword tightly in his grip. Sleeping with his sword was an old, but dangerous habit he had developed. His gaze locked onto the door, as a tall, familiar figure walked in.
Grayson gasped instantly recognizing the figure. It was his love, but his white eye glowed brightly in the darkness. Grayson squinted until his eyes adjusted to the white light the hybrid's eye emitted.

  "Drake?" He said in shock, despite knowing that wasn't his friend.

  "Darling, you should know better." The dark voice said, almost tauntingly.

The ex-commanders eyes widened, his heart pounding in his chest from fear. Herobrine was in control of his body. He had never heard the demon speak, and it sent chills down his spine. His body began to sweat and tremble, but he stayed standing firm.

  "You..." Grayson hissed. "Leave Drake alone!" He demanded.

  "You should be more worried about yourself, darling." Grayson growled again, not liking how he kept referring to him as "darling".

Before Grayson knew it, he vanished, suddenly re-appearing directly in front of him. The blonde gasped, his emerald eyes widened. He wanted to fight to protect himself, but he couldn't bring himself to do it. He couldn't risk hurting Drake.
The possessed Drake's hand wrapped around Grayson's wrists, holding him tightly. Grayson hissed at the pain, the hilt of his sword slipping from his fingers. He listened as the metal clattered on the stone ground, his defense now gone. He looked up at this hybrid's face, searching for any sign of his love in those eyes and that wide cynical smile. All he was able to find was a sickening look of insanity and lust. 
Drakebrine pushed Grayson against the wall, slamming his back onto the stone. Grayson grunted in pain, his possessed lover holding his arms above his head to restrict his struggles. He hissed, opening his eyes to look at Drakebrine once more. He was somehow stronger while possessed, unless Drake really was that strong... A blush spread on the blonde's cheeks.

  "I know of your little...attraction to the hybrid." The demon cooed, tilting his head.

Grayson's blush worsened. If Herobrine knew, then did Drake know all along as well? He growled, the burning in his face intensifying in embarrassment. Not only that, but Drake's face was so close to his, almost close enough to kiss. Unfortunately, it wasn't truly Drake.

  "Drake, snap out of it!" Grayson tried calling out to him, but to no avail.

  "Trust me, darling. Drake won't be back for awhile, leaving more time for you and I." He sung, holding Grayson's arms above his head with one hand, and holding his chin with the other.

  "Wha-" Was all Grayson was able to get out.

The possessed Drake lunged at him, his teeth digging into Grayson's bottom lip, making him gasp and cringe in pain. The blonde could feel blood beginning to seep from the small wound he had left behind. Drake's teeth lifted, only for Grayson to feel him shove his tongue into his mouth.
Their tongues wrestled with each other, coating Grayson's mouth with Drake's saliva. The possessed hybrid explored the blonde's mouth, tracing his tongue against any nook and cranny he could.
Grayson's mind was swarming, unsure rather he was enjoying this or not. It was Drake's body, but not his conscious. It wasn't the man he had fallen in love with. But yet, he was finding pleasure in it. This was the closest he'd ever get to having Drake love him back, even if it was wrong.
The vessel pulled back, letting both of them gasp for breath. Grayson swallowed the mixed saliva in his mouth, his face burning. Drake's right hand moved under Grayson's shirt, making the ex-commander moan. Grayson's emerald eyes looked into the hybrid's, aware of the demon's sick intentions.

  "Just pretend that I'm Drake and this will be so much easier."

He tossed Grayson onto the bed, and crawled on top of him. His face was inches away from Grayson's, the two staring into each other's eyes. The hybrid's hand once again moved under the ex-commander's shirt, stroking his chest. A shiver ran up Grayson's spine, his face sweating and breathing heavily.

"Just relax. We have a long night ahead of us~"
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I'll make a part two if you guys want. After this should be Luke x Emperor then Drake x Herobrine.