Kakyoin, who in this universe dies at the hands of Dio, reappears after a Stand attacks catapults him into the future. A 56 year old jotaro gets a call from the speedwagon foundation and hes forced to confront him while avoiding the subject of his absence in this world.

Jotaro offers to host kakyoin while they figure out what's going on and how to get him back to his world. But jotaro isnt sure he ever wants to give him up again, despite the space-time consequences of doing so. Kak wanders around joots huge but empty, heartless house.

Joot explains that the kakyoin of his time simply fell out of friendship with him. But kakyoin catches on, eventually, and joot breaks down having to explain that he died before their feelings could really be explored like they deserved.

Mmm angst mmmm
Some ideas
Joot has a terminal illness, reunites with kakyoin just to lose him again to time travel and then he dies.
Kak insisting on getting physical because he feels like hes running on borrowed time. Joot cant resist even tho it feels wrong to fuck this 17 yo

"No matter where I am now, just remember this... in the past, when we were really together, it was the happiest time of my life, Jojo. And I wouldn't trade anything for that time we had together... even my life."

Kak climbs into joots bed at 3 in the morning after theyd spent the day avoiding the obvious. That joot is divorced with a kid and kakyoin is dead. Jot stays up all night after coaxing kak into his arms, listening to his breathe and feeling his heartbeat between his ribs.

Their time together is like a ticking time bomb. Jotaro knows their time is limited.
"You know, when I saw you again in the hospital room... I thought I had died, at first. I thought that my body had finally given up."
"How did you feel about dying, then?"
"I loved it."

Jotaro spends most of his time sleeping and biding his time. He feels guilty for sleeping when kak is there, not wanting to waste any more time with him like he had so stupidly done as a teen. He didnt want to take him for granted.
"Get some rest. I'm not going anywhere."

Kak ends up meeting with joseph and holly, sparking an emotional, intimate conversation about just how much Jotaro changed after kak died. Joseph says the world is jotaros oyster, but it's like nothing is enough.
"When you died... it's like Jot died a little, too."

The exact time of Kaks death approaches (three days from when he was teleported) and jot doesnt know what to do. He's weak but too proud to admit it, body worn by medicines and treatments...
"Kak, I'm so sorry things happened this way."
"I'm not sorry. Not at all."

Jot had accepted that he'd die early many years ago. Hed planned on going out blazing in battle, but cancer is just a formidable of a foe.
Kak sits on his bed as he lays and offers him a water. Jotaro almost slaps it out of his hand.
"I love you so much."
"I know."

Should I write this out or is it too sad

God the smut would be so delicious...
Scandalous underage, daddy jotaro who is way out of his league, emotionally volatile, ...
"Please just fuck me. I need you..."
Joot giving in to having exactly what hed been yearning for all these years later