In order to have it better fit in with the current universe of my story, I've changed the hallucination up a bit.
Oliver had just finished his morning jog as he approached the Queen family mansion.
"So, how was your run?" Laurel asked as Oliver got out of the shower and grabbed a towel for himself and for her.
"You know how it was I told you about in the shower. Here you go." Oliver said as he handed the towel to Laurel.
"How could I forget?" Laurel asked with a smile as she put the towel on and exited the shower before kissing him.
"Dinah Laurel Lance Will you marry me?" Oliver asked her.
"I think I already answered that question." Laurel said as she held up her hand to show her engagement ring.
"Right." Oliver said with a smile.
"Ok. Time to get ready. My sister will be here soon." Laurel said as they headed out.
Oliver and Thea were sitting in the living room of the mansion and Oliver could tell that Thea was trying to butter him up for something when she gave him a present.
"What's this? The wedding isn't for a few more days." Oliver asked his sister.
"I know, it's just a pre rehearsal dinner gift." Thea said as Oliver opened the gift.
"Well, little is right." Oliver said as he pulled a rock out of the box.
"It's called a Hozen. It symbolizes reconnecting, like you did with Laurel." Thea said with a smile.
"Thea, it's a rock." Oliver insisted.
"It's a very thoughtful gesture from your amazingly loving sister. Who by the way is just glad that you and Laurel are finally getting married, I never thought that I'd be the one who married first." Thea said and Oliver smiled.
"Where is your husband?" Oliver asked.
"Right here." Roy said as he entered the room.
"Nice to see that you can be on time for once." Oliver said to his brother-in-law, just to have Thea smack him.
"Like you're one to talk considering you're 10 years late in marrying Laurel while Roy and I are already starting a family." Thea said as Robert and Moira Queen entered the room.
"Well, what's going on here?" Robert asked.
"Thea gave me a rock." Oliver said, causing both Robert and Moira to smile.
"Oh." Moira said.
"Ha ha ha!" Thea said sarcastically.
"Looks like I got here right on time." Tommy said as he walked into the mansion.
"Tommy, I'm glad you could make it." Oliver said as he got up and hugged his best friend.
"What, you didn't really think I'd miss my 2 best friends getting married did you?" Tommy asked.
"You know, I once thought that you'd be the one to marry Laurel." Oliver said.
"I wish, but she chose you in a heartbeat." Tommy said and suddenly Oliver had a strange moment where he saw Tommy under a building with a wooden board through this chest.
"Earth to Ollie. You okay?" Tommy asked as he waved his hand in front of Oliver's face, snapping him out of it.
"Yeah, yeah I'm fine, must be rehearsal day jitters is all." Oliver said.
"Let's go, champ. You got a 6:00 appointment at the tailor's, got to fight traffic." Robert said.
"Oh, dad, you know I'm not much of a fighter." Oliver said.
"Tell that to the paparazzi you punched." Thea reminded him.
"10 years ago." Oliver protested.
"Still." Thea said.
"Might as well be a lifetime. You're practically a completely different person. You both are." Moira said proudly.
"Don't start crying again, mama. Just save all the tears for the actual wedding." Thea said.
"Remember how much she cried at your wedding?" Oliver asked her.
Thea chuckled before saying "I thought she was going to ruin her dress from her tears."
"I think what your mother's trying to say is that both of us feel blessed to have watched the two of you grow up. I mean, Oliver, you're now the successful mayor of Starling City and you're finally marrying Laurel, who is the beautiful District Attorney of the city and Thea, the owner and manager of Starling City's most popular nightclub Verdant and is actually preparing to start a family of her own." Robert said with a smile as a maid knocked over a vase by accident, but Oliver somehow caught it instinctively.
"Whoa! Sweet reflexes." Thea said to her brother, who just nodded.
After Oliver watched a guy in a green hood save him and his father from a mugger, he began to have flashes of a different life. They felt so real, though he was certain they'd never happened, or maybe they had, he wasn't sure what was or wasn't real anymore, especially after he tracked the vigilante down and revealed him to be none other than John Diggle.
Oliver was now back at the mansion for the rehearsal dinner, but more and more of these strange flashes kept appearing and then Diggle showed up at his house.
"You got a minute to talk?" John asked.
"I'll be right back," Oliver said to Thea, who nodded, "Now what happened to I should just go back to my life?" he asked Diggle.
"Look. Have you been getting out into the city lately, seeing maybe a particular building that shouldn't be there?" John asked and Oliver nodded.
"Smoak Technologies." Oliver said.
"Yeah." John agreed.
"Yeah, when I was with my dad, I-I saw it, and it felt, uh- - It felt wrong." Oliver said.
"Right. Felicity Smoak says she never owned a building or a company. I don't know what's going on here, but when you left, I started having these, uh." John said, not sure how to describe them.
"Visions, right?" Oliver asked and John nodded.
"Like, um- uh, memory flashes." John said
"I'm getting them, too. John, what is happening to us?" Oliver asked.
"I have no idea. I've seen some weird things in the Stan, even stranger things as the Hood, but this- Look. When you left, I tried to draw one of these, uh, memory flashes, as you call them. Never been much of an artist, but this is what I came up with." John said as he showed Oliver a sketch of the Hood.
"What hell?" John asked.
"I don't know. Been remembering things. It's like they're dreams but they're not, John. I don't think that any of this is real. We're real, but whatever's playing these head games with us, I don't think it's fully working." Oliver said.
"Are you sure?" John asked.
"Because the Queen's Gambit- they've put me into a world where I never got on my father's boat." Oliver finally realized.
"Oliver, I don't know if these are memories or feelings, but I think you're a hero, and I don't think it's because of any boat." John said
"These head games aren't over. They are gonna push back against whatever we do." Oliver said.
"Push back? Like how?" John asked, right as a man in combat gear and a mask that was especially familiar to Oliver attacked them, only for him to be skewered by a sword.
"Like that." Oliver said as he and John looked at Sara Lance, who was currently the holding the sword.
"How did I do that?" Sara asked.