Alternate point-of-view fics, perhaps? By that I mean fics where the author retells the story from the point-of-view of a minor character who was pretty much ignored by canon or didn't even exist.
For example, there's a really awesome Lord of the Rings fanfiction novel that retells much of LoTR from the POV of the ghosts of the dwarves who died in the Battle of Five Armies (and Gimli and also the living dwarves who aren't Gimli). Because that author liked the dwarves, dammit, and Tolkien sort of pushed them offstage after the Hobbit and relegated all their deeds to a few lines in the Appendices. You get much of the War of the Ring, just from a dwarven POV instead of hobbitses.
And yeah, lemons generally didn't require you knowing much beyond the most basic facts about the involved characters.
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For example, there's a really awesome Lord of the Rings fanfiction novel that retells much of LoTR from the POV of the ghosts of the dwarves who died in the Battle of Five Armies (and Gimli and also the living dwarves who aren't Gimli). Because that author liked the dwarves, dammit, and Tolkien sort of pushed them offstage after the Hobbit and relegated all their deeds to a few lines in the Appendices. You get much of the War of the Ring, just from a dwarven POV instead of hobbitses.
And yeah, lemons generally didn't require you knowing much beyond the most basic facts about the involved characters.