Yes, I know Alphonse didn't sleep and Edward slept on the couch a lot. I'm saying they stayed in the guest room (that may not have even existed in the series) for the purpose of the story.
When the train pulled into Risembool station, Winry smiled. It was always good to come home, regardless of the reason. It was beautiful and calm here, so it was perfect for someone that needed a break from life. After piling out of the train, they started off for the Rockbell residence. They walked silently along, reaching the house after a minimal amount of time.
Winry ran on ahead when they neared, setting her things in her office before finding Granny. The situation was explained, bringing a grim look to the elderly Rockbell's face. With a nod, she walked to the front door and opened it, just as Denny was about to knock. "Come in, you three." She looked at Edward as he walked in, her face softening. "Welcome home, Edward."
Edward didn't even look down at Granny before he headed upstairs to the spare bedroom. The brothers had spent their nights visiting Risembool in this room. There was a single bed, where Edward had slept, and a desk and a bookshelf. A single window illuminated the small room. Edward closed the door, alchemically sealing it. No one could bother him now.
With a heavy tread, Edward walked slowly to the bed and sat on the edge of it. Instantly, memories of being in the room flooded his mind in a deluge of despair, making him grab his head in his hands and break down. He sobbed quietly to himself for a moment before he fell sideways onto the bed, gripping the sheets tightly in his fists. He wished his mother were here to comfort him, that his brother would just appear at the door. That this was all just a horrible nightmare that the homunculus had planted in his mind to tease him.
Deep in his heart, however, he knew this to be false. He had wounds from fighting Envy, he had scars from struggling against the chains. He had the image of his brother being impaled on Envy's arm ingrained into his psyche, appearing before his tormented eyes whenever he closed them. He would never be free from that image as long as he lived.
He curled up on the bed, pulling his knees to his chest. He buried his face into the pillow and clutched the pillow tightly, trying his best to stifle his sobs. He felt utterly pathetic as he lay there, falling apart like some child. He expected this from Winry, but not himself. He was of steel-will and immune to death. Yet here he was, crying over something that few people even considered alive. He knew that his brother was human, whether anyone else admitted it or not. This is what made the death so horrid. His life had been taken once, only to be restored by Edward. His life was now taken again, this time forever. He knew committing the taboo a second time would have no effect, thus he pushed the thought away. The only other thing he could think of was leaving.
The thought crossed through his mind repeatedly, refusing to leave him in peace. It seemed that he had finally found his solution, though it had been present even while the attack was happening. As he lay there, chained on the floor, his only wish was that it was him instead. He didn't want to leave Alphonse alone, but he was now alone and couldn't stand it any longer.
Slowly he sat up, his hair slightly disheveled and his face streaked with tears. He grabbed a pen and piece of paper from the desk and sat down, beginning to write. He finished penning the letter and set it down, setting the pen back in the drawer. He made his bed and pushed in the chair. The piece of paper seemed to stick out, so anyone coming in would notice it easily. He walked to the door and unsealed it before going to the window. It was the only one on this side of the house, so he clapped his hands to the wall. A small stairway formed, allowing him to reach the ground quickly. He returned the stairs to their original form and started off. The sun was slowly setting in the sky, casting a golden glow over the land.
Edward turned towards the river where he and Alphonse had sparred the first time after he had received his automail. It was the true beginning of their journey and it would be the final end. When he reached the water's edge, he gazed out across the slow water. It was reflecting the light and reminded Edward of the sun glinting off his brother's empty body. He faced the water, hands poised to clap.
x-x-x-x
After Edward headed upstairs, the others all congregated in the kitchen. They could barely make out the distant, partially-muffled sobs of despair coming from upstairs, but they didn't know how to console the boy. He was beyond their help for the moment. Winry sighed sadly and wiped away a few tears. After the sounds stopped and no other noises were heard, she grew worried. "I'm going to go check on him, see if he's hungry." The others nodded and she hurried away.
Her socked-feet moved silently up the stairs, pausing outside Edward's room. She rapped once softly. "Edward?" she said gently, "I'm coming in." She slowly opened the door to nothing. The window was open and a piece of paper was barely fluttering on the desk. That wasn't there last time I cleaned up here… Curious, she walked over and looked down. The words on the page made her heart stop. It read:
"I'm done.
I could do nothing to save my brother.
I alone am responsible for his death, so I alone must suffer.
There's no stopping me. I need this release from this world.
Please don't come after me. My journey is ending where it began."
The last sentence is what truly chilled her heart and caused her to flee the room, leaving the paper to float slowly to the floor:
"I want Alphonse to be buried between me and Mom."
As Winry's feet pounded down the staircase, the other occupants of the house worriedly ran to see her slip her shoes on her feet and sprint full out away from the house. The soldiers took off, ready to kill any intruder. Pinako followed as well, running as quickly as she could. Winry headed towards the remains of the Elric house, trying her best to stop what Edward planned to do. As she ran, her feet caught and she fell to the ground. As she did, her head turned to the side to catch a glinting by the nearby river. As the soldiers caught up to her, she stood and abruptly changed directions, headed towards Edward.
x-x-x-x
As Edward stood near the river he clapped, touching his right arm. The panel on the back of the arm came off into his other hand and shaped itself into a perfect, razor-sharp knife. It was just long enough to get the job done. His eyes flitted over it, his mind catching a glimpse of Alphonse's face reflected on the surface. He smiled sadly. "I'm coming to join you, Alphonse. I'm sorry you've been alone this long." He held the dagger in his hand firmly and aimed it at his heart, driving in deeply just as Winry pounded over the hill.
Winry screamed and took off down the hill, ripping herself out of Maria's restraining hands. Edward fell to the ground, his own blood pooling around him and mixing in the nearby water, staining it red. Winry collapsed to her knees beside him, setting her hand against his neck. The pulse was already gone from it and she covered her face, leaning her head and hands against his side. How could he do this? How could he leave us? We already lost Alphonse! She realized what she was thinking and sobbed even harder when she thought next. Alphonse and you were truly alone without the other…
Denny came down and gently helped Winry stand, moving her away from Edward. Maria also checked for a pulse, sadly shaking her head as Pinako came over the hill. She froze at the scene below her as tears came to her eyes. She hadn't cried since Trisha died. The Elric family of Risembool was no more.
