The Future Us are Lovers

Who the hell are you?

"I can't believe he just hung up on me! Kacchan you can't just do whatever you want. Jeez you're so selfish sometimes and you know you're not the only one that's "pent up." Izuku blushed as he muttered angrily to himself

"Oi." Bakugou sat up from the couch
(Who's muttering? So damn noisy.)

"Oh uh you're awake. Sorry if I woke you, are you okay? Does anything hurt?"
(Please tell me he didn't just hear what I said.)

"I'm fine, who the hell are you?" Bakugou looked at the person across the room as they walked towards him

(Did he forget me?)

Izuku sat down in a chair across from the couch and explained the whole situation to Bakugou leaving out the details about being pent up.

"So that's what happened?" Bakugou frowned
(Sounds like bullshit. Or the older me needs to step up his freaking game.)

"Yea it looks like older Kacchan and younger Kacchan aka you, switched places due to the quirk. It's just a guess, but I think the quirk needs to switch objects of the same matter to work which would explain why older Kacchan is in the past and you are here in the future or my present so to speak. Otherwise they would've just sent future Kacchan to the past." Izuku explained

~Essentially what Midoriya is talking about is the "Pauli exclusion principle" which states "two or more identical fermions cannot occupy the same quantum state within a quantum system simultaneously." To dumb it down for you "two or more identical objects cannot occupy the same space at the same time." Meaning both Bakugous cannot be in the same place at the same time. What happens if they are? Idk I'm not an Quantum mechanic or a Physicist, but there's your science lesson for the day lol~

(Hold on, why was older me at Shitty Deku's house?)

"Actually I'm surprised nothing has been affected yet considering time manipulating quirks are very complex and dangerous to use. If you're not careful it could rip a hole in the fabric of space and time. We don't even know all the specifics of this quirk which is a problem on top of a problem. I'm left with more guesses and questions then actual answers. Hope they interrogate that guy and woman from earlier." Izuku muttered to himself

(Damn this Deku is just as annoying as mine.)

"So... you're future Deku?" Bakugou asked calmly
(Wait did I say mine?)

"Uh to this version of you, yes." Izuku smiled

"Quit it with the stupid versions time travel crap, I didn't sign up for Physics!"

"S- Sorry didn't mean to make you mad." Izuku apologized

(Hell no... I don't believe it. This stupid quirk or something is trying to trick me.)
Bakugou rose his arm

(Hm? Is he raising his hand to ask a question?) Izuku looked at Bakugou confused

Bakugou made a spark and swung his hand down onto the coffee table breaking it.

Izuku ran over to him.
"Wait! Wait! What are you doing?!"

Bakugou made more explosions.

(This isn't real, there's now way. You can't trick me!)
"Don't lie to me damnit! Where the hell is the villain? Come out and fight me coward! You think showing me this shitty illusion can catch me off guard? Try again you bastard!"

"No Kacchan wait! It's not an illusion! Please stop breaking our things." Izuku was trying to hold him back
(Dang it I said our. Oh well I can't worry about it now.)