Fics like Lewd Island of Giant Insects

Kyochuu Rettou, but with more sex.

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1. Castaway on an Island of Insect Monster Girls by All_Sins_Stories (巨蟲列島 | Kyochuu Rettou | The Island of Giant Insects (Anime), The Even Bigger Island of Giant Insects, more)
2. Extended Lemon Collection by TheRisingDryad (復讐を希う最強勇者は 闇の力で殲滅無双する | Fukushuu o Koinegau Saikyou Yuusha wa Yami no Chikara de Senmetsu... (Manga), 巨蟲列島 | Kyochuu Rettou | The Island of Giant Insects (Anime), more)
3. Kingdom Hearts: The Heir of Hokuto by Azmodan0210 (北斗の拳 | Hokuto no Ken | Fist of the North Star, Kingdom Hearts (Video Games), more)