 If you liked
Jishou Akuyaku Reijou na Konyakusha no Kansatsu Kiroku.
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 ...then you might like
Akuyaku Reijou? Iie, Gokuaku Reijou desu wa
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Both isekai stories are from the POV of the non-reincarnated character. Where the MC falls for the reincarnated character and it changes their future/how they act. In one story the Prince falls for the reincarnated Villainess and in the other the Villainess falls for a reincarnated knight.