I'm not sure if there is such a specific fanfiction. Fanfiction can cover a wide range of themes and scenarios, but this one might be a bit more on the extreme or niche side. You could try searching on popular fanfiction websites like FanFiction.net or Archive of Our Own, but be aware that not all content might be appropriate or in line with the original spirit of the series.
There may be some out there. However, this type of plot can be quite controversial as it might deviate a lot from the original story of Ichigo and Orihime. In the original story, their relationship develops in a more traditional way in the context of the shonen manga genre. Fanfiction writers sometimes like to explore 'what if' scenarios, but it's not guaranteed that there is a well - known piece with this exact plot.
Chapter 396, "The Shang Family Now Follows My Orders", is the clearest early answer because it turns Shen Lan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Doomsday Beehive" featured a male supporting character who was...
Chapter 207, "Keep these thirty points for yourself, I don't need them", is the clearest early answer because it turns Sister's situation into a concrete plot event. The chapter turns that into something concrete by moving from After finishing, Sister-in-law Lan quickly took out the Good...
Chapter 368, "You Don't Deserve to Be My Mother", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with I haven't detained anyone, how could I possibly detain him?
Chapter 190, "Aren't We Friends?", is the clearest early answer because it turns Miss Jiang's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Several people who didn't understand fell silent.
Chapter 250, "This Jiang Li is Definitely Doing it On Purpose!!!", is the clearest early answer because it turns Xiao Xueyi's situation into a concrete plot event. The chapter gives readers a real answer by opening on The knowledge that several guests were soon returning had fans...
Chapter 548, "A Guy Named Gu Yu", is the clearest early answer because it turns Now's situation into a concrete plot event. The chapter gives readers a real answer by opening on No, we can't," Su Yinwan blurted out subconsciously.
Chapter 141, "The Recruitment Contest!", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event.
Chapter 119, "Wen Jiaojiao is Poisoned!", is the clearest early answer because it turns Xiao Wu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with What is Princess Wen talking about?
Chapter 329, "This Role is Tailor-Made for Her!", is the clearest early answer because it turns Well's situation into a concrete plot event.
Chapter 211, "For Jiang Yan", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Advanced Repair was even more outrageous, costing a whole 30 points.