Kou-1 desu ga Isekai de Joushu Hajimemashita
I'm a High Schooler, But I Became an Owner of a Castle in Another World

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The story has a protagonist in a Polyamory with romantic development in Fantasy/Isekai. Includes 'Polygamy with romantic development', 'Multiple Lovers/Multiple Partners in an open romantic relationship', or an open romantic relationship with a harem. Also True Harem, Harem Ending, Harem-seeking, Hard-Working, Devoted, Couple Growth, First-time Intercourse, Marriage tag.

(PART 2) https://myanimelist.net/stacks/46938

Adventurer party/Hero's Party in fantasy/isekai
https://myanimelist.net/stacks/36966
Slave Companion in Fantasy/Isekai
https://myanimelist.net/stacks/38526

Story with lewd activities in fantasy/isekai
https://myanimelist.net/stacks/37161
Protagonist's child is born/pregnancy during story (SPOILER WARNING)
https://myanimelist.net/stacks/37305

The story will have romantic development between the protagonist and monster girls female leads of the story. Includes Couple Growth tag.

Has a Female Lead of a Human-like Race/Creature in fantasy/isekai
https://myanimelist.net/stacks/38185
Has a Female Lead Beastkin in fantasy/isekai
https://myanimelist.net/stacks/37979
Protagonist becomes a non-human in fantasy/isekai
https://myanimelist.net/stacks/37527

Has a Female Lead of a Human-like Race/Creature in Modern Setting on Earth
https://myanimelist.net/stacks/47294

Additional (currently no MyAnimeList page):
-(Manhwa) Die Melusine

More than one person (including the protagonist) is transported, reincarnated, or transmigrated to another world. Includes Group Isekai/Class Isekai. Also Transportation, Reincarnation, Transmigration. Note: this list may hint future character identities in a series.

(PART 2) https://myanimelist.net/stacks/48125

Additional List:
Female Protagonist falls into an Otome Game/Eroge/Game world
https://myanimelist.net/stacks/37528
Male Protagonist falls into an Otome Game/Eroge/Game world
https://myanimelist.net/stacks/37536
Protagonist was thrown into a Novel/Book world
https://myanimelist.net/stacks/37920

The side character is the Regressor/Isekai, the protagonist is not.
https://myanimelist.net/stacks/45493

Human Protagonist's Female Lead, or the Female protagonist herself looks human while being a part of a non-human race/humanoid creature in fantasy/isekai. This list is for any non-human race other than Beastkin, which includes Dragon, Mermaid, Demon, Vampire, Elf, Spirit, Angel, and others. Characters closely resemble humans other than horns, ears, tails, teeth, wings. Also Monster Girls tag.

(PART 2) https://myanimelist.net/stacks/49463

Has a Female Lead Beastkin in fantasy/isekai
https://myanimelist.net/stacks/37979
Protagonist becomes a non-human in fantasy/isekai
https://myanimelist.net/stacks/37527
Romantic Development with Monster Girl Female Leads/Heroines
https://myanimelist.net/stacks/36952

Adventurer party/Hero's Party in fantasy/isekai
https://myanimelist.net/stacks/36966

Has a Female Lead of a Human-like Race/Creature in Modern Setting on Earth
https://myanimelist.net/stacks/47294