One idea could be a story where Issei and Irina have to team up to face a new, powerful enemy that threatens their world. They start off as friends but gradually realize their deeper feelings for each other during the course of the adventure.
Perhaps a fanfic where Issei and Irina are sent on a mission to a parallel dimension. In this dimension, their relationship is different from what they know in their own world. They have to adapt to this new situation and in the process, they learn more about each other and their own feelings. They might face challenges specific to this dimension that force them to rely on each other more, strengthening their bond.
Chapter 493, ", The Enemy is in Terra!", is the clearest early answer because it turns Gu Hang's situation into a concrete plot event. The chapter turns that into something concrete by moving from One banquet after another, one meeting after another, one social... to In his words: "I've risen through the ranks at breakneck speed in....
Chapter 24, "The Forest Of Three Calamities", is the clearest early answer because it turns Jack's situation into a concrete plot event. The setup is Standing before the Throne of Power were the five individuals left..., but the pressure keeps building through King Derek stared deep into their eyes, his fingers tapping on the....
Chapter 468, ", Reverse Beheading", is the clearest early answer because it turns Saru's situation into a concrete plot event. The setup is Again turning his head, the remaining two Terminators had already..., but the pressure keeps building through Not only them, but everyone else as well..
Chapter 39, "A Threat To Other Threats I", is the clearest early answer because it turns Great Elder White's situation into a concrete plot event. The chapter turns that into something concrete by moving from The problem isn't that the process is speeding up! to Yes, we were simply joking." The shorter of the two standing figures,.... What makes it stick is that the chapter closes with Great Elder White Fang sighed and shook his head.
Chapter 443, ", the mobilization ratio must be higher!", is the clearest early answer because it turns Green Skin's situation into a concrete plot event. It opens with Inside the Temir Star System, on the flagship 'Giantsfield' of the... and closes on The earliest had been conquered for over fifty years; the most.... The key payoff is that the chapter closes with The sudden advance of the human military took him by surprise.
Chapter 499, ", I Have Returned", is the clearest early answer because it pushes Alliance into a new phase or setting. The chapter gives readers a real answer by opening on Eight months have passed since that brutal duel in which Phoenix... and ending on More importantly, as a relatively new force, and with Gu Hang always....
Chapter 391, ", Mr. Gu", is the clearest early answer because it turns Star Domain Government's situation into a concrete plot event. The chapter gives readers a real answer by opening on All this being implemented within the Dragonhawk Star Domain meant... and ending on Although someone had flattered him by saying his efficiency was....
Chapter 439, ", Temir No.5 Meat Grinder", is the clearest early answer because it turns Green Skins's situation into a concrete plot event. The setup is This kind of large-scale decisive battle is something the Green Skin..., but the pressure keeps building through After suffering losses a few times, they had grown smarter..
Chapter 97, "Riding Toward The Empire III", is the clearest early answer because the buildup finally cashes out in a real clash. It opens with Lord Leah had barely settled into her seat, brushing splinters off... and closes on Not worth the effort." Lord Terrace shrugged.. The key payoff is that the danger stops being abstract and the conflict around exploration becomes immediate, forcing the surrounding cast to react under pressure.
Chapter 135, "Checking Out Rewards", is the clearest early answer because the buildup finally cashes out in a real clash. The setup is The warm morning sun illuminated the small cottage on the outskirts..., but the pressure keeps building through Keith and Narna watched him, a mix of gratitude and apprehension....