Fics like Slumbering Reincarnation

It's rare for a boy to be older than their parents. Especially those who are blood-related, and not a child to a woman from a remarriage. Rudeus was special, granted a second chance to make things right in another world. If he was to no longer be a NEET virgin, then he needed to do things differently the second time around. He had to become a better man: both physically and mentally. For the summoned hero, the former was quite easy, given the benefits of enhanced mana potential from birth. The latter was the difficult part, largely a result of coming into this world with a preordained attraction to the teen mom of his dreams. When an opportunity with Zenith Greyrat finally presents itself around his 10th birthday to get a step beyond his former self, Rudeus wastes no time taking advantage of such an open opportunity.

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1. Mushoku Tensei: The Second Rebirth Vol 1 by Peacekeeper7 (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
2. Bridal Training by UplanderDoom (無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime), 無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels))
3. The Small Things by Kyonko802 (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
4. Your Stars Were Bad by Kiyoponical (Re:ゼロから始める異世界生活 | Re:Zero Starting Life in Another World (Anime), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime), more)
5. The Theatre of Magi Semperhorti by Natsume%20Kafka (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
6. A Jobless Assassin's Reincarnation by Papaflimzy (無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime), 呪術廻戦 | Jujutsu Kaisen (Anime))
7. A collection of dirty stories from the Greyrat family by colox76 (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
8. Mushoku Tensei: Swordless Reincarnation in Another World by Call_Icon_Knightly73 (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
9. Re:Beginning: A Job-Filled Reincarnation by Crimster (無職転生 ～異世界行ったら本気だす～ - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote, 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
10. The Voyeur by Quicksliver (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
11. Isekai Shenanigans by EternalWhisper (Re:ゼロから始める異世界生活 | Re:Zero Starting Life in Another World (Anime), 転生したらスライムだった件 - 伏瀬 | Tensei Shitara Slime Datta Ken | That Time I Got Reincarnated as a Slime - Fuse, more)
12. What if: Paul Survives by Nill666nill (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
13. Starting Life in the Six-Faced World from Zero [Comic] by EternalWhisper (Re:ゼロから始める異世界生活 | Re:Zero Starting Life in Another World (Anime), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
14. Lolimancer in Place of a Lolicon! by Petra_chan (Re:ゼロから始める異世界生活 | Re:Zero Starting Life in Another World (Anime), 無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), more)
15. Fandom smut prompts by Squirreling (Dragon Ball, Fairy Tail, more)
16. My Life (After Countless Reincarnations) in Mushoku Tensei by AzrailDerzhavina, Hannah4Chan (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
17. Starting Life in the Six-Faced World from Zero by EternalWhisper (Re:ゼロから始める異世界生活 | Re:Zero Starting Life in Another World (Anime), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime), more)
18. Mushoku Tensei: Brotherhood by KazuPhoenix (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))
19. Isekai Park by FFTnosEstafo (South Park, この素晴らしい世界に祝福を! | KonoSuba: God's Blessing on this Wonderful World! - All Media Types, more)
20. Rudeus Gets Cucked by LennyFaceReal (無職転生 異世界行ったら本気だす - 理不尽な孫の手 | Mushoku Tensei: Isekai Ittara Honki Dasu - Rifujin na Magonote (Novels), 無職転生 ～異世界行ったら本気だす～ | Mushoku Tensei: Isekai Ittara Honki Dasu | Jobless Reincarnation (Anime))