How Well Do the Double Black Cubs Match with the Gojo-Natsu Cubs?

(Main story complete, extras still coming~) [Blurb]: A rumor has recently been circulating in the underworld. The Port Mafia is arranging a marriage alliance with a family from the jujutsu world! Apparently, the intended match is the Port Mafia’s Gravity Manipulator and the strongest jujutsu sorcerer’s kids! The news shocks countless people in the know, especially those who know a little about the circumstances. …Aren’t both families’ kids boys? In response to the rumor Gravity Manipulator: …That’s a lie! My son is only five! Five! Gojo Satoru, keep your son away from mine!!! Strongest Jujutsu Sorcerer: Hey, my son and yours are just super fated to meet. How about we arrange a childhood engagement for them? Gravity Manipulator: Get lost!!!*$&%^·#! Meanwhile, the two half-grown kids at the center of the rumor exchange a glance and confirm each other’s identities. Oh, what a coincidence. You came here from a parallel world after you died too? Reader’s Guide: 1. The protagonist is the bottom. Double Black kid (bottom) × Gojo and Geto’s kid (top). The Double Black kid’s original world follows the BEAST route, while Gojo and Geto’s kid comes from the original-story route (with some plot changes). Both kids are deeply traumatized by their respective original worlds. 2. The new world is set in the main world’s happy-ending route, where everyone survives. Includes Dazai and Chuuya, Gojo and Geto, Wei and Ran, and others. The parents’ love stories have a significant role. 3. This is not a male-male pregnancy story. The Double Black kid was born as a result of an ability and human experimentation (the Gojo and Geto kid’s circumstances are similar and have something to do with the mastermind). The two characters inherit their parents’ genes and some of their abilities, and they won’t stay kids forever (that’s part of the plot, so I can’t spoil it). Both are difficult people with terrible personalities. 4. The kids from the original worlds are the same people as the kids in the main world, sort of like being reborn. There’s no taking over another version of themselves in a parallel world. 5. The plot itself isn’t angsty, but the flashbacks are a little dark, and there’s a lot of original worldbuilding. Coming soon: First: Original danmei, The Eastern Nonhuman Is None of the West’s Business. Pairing: Eastern beautiful ghost × Western clergyman. Second: Derivative gen fic, Tomie’s Son Wanders into the World of Conan. A friendship-focused, everyone-dotes-on-him story. I wrote the opening, and I’ll definitely finish it! Theme: The night is too cold; it’s better to have the sun by your side