Your name is Jonathan Joestar. After your decisive battle with Dio, your fated brother and lifelong rival, you wake up once more in your young body.
You: "I must have died sometime in the future... I wonder how Erina and my child are doing."
Magic Mirror Stand, Cherubim [shows a beautiful blonde, blue-eyed woman in a wedding dress inside a church]
You: "Huh... A wedding dress, a church? Who is this man?! Wait, could it be... Could Erina have remarried after I died? I... I suppose I can understand. It's all my fault. It must have been so hard for Erina, raising a child alone..."
The magic mirror then shows another scene [a baby with a star-shaped birthmark on his shoulder, sitting alone in the dark and crying]
You: "What's going on?! What room is this? Where's Erina? Erina would never abandon her child. Wait... Why does this child have black hair?! Does that mean I'll marry someone else in the future? Whose child is this?!"
The magic mirror [silently shows the villain with a face just like DIO's]
["JOJO! Your first son was born to me, Dio! Hahahahahaha!!"]
You: "…??????????????"
1v1, switch, with a preference for the top, pairing with Dio Brando
Theme: JOJO fanfiction that is all sweetness and no angst.