Warning

Ok, so I'll say it straight up. This is going to be a dumb wish fulfillment gotta catch me all harem fanfic.

The main character will have Dragon slayer unrealistic proportions for his shaft. Why? You ask... Because I like it and that's what I'm gonna do. If you're worried about the female characters having to deal with that, you can think of it one of two ways:

1- We are working on hentai logic here, so any organ that doesn't have a purpose during intercourse, just doesn't exist during sex.

2- The girls involved just have space magic modified genitals, so it's much bigger inside than outside.

Hope those help you not question biology during 18+ scenes, cause quite honestly it won't be present for the most part, at least not real biology. Only Hentai Biology prevails.

About the worlds that this fanfic will have: Fairy Tail(First world), My hero Academy, Solo leveling, Tensura, Naruto, Overlord, Genshin impact, Dragon ball, Omniscient Reader's Pov, Demon slayer, Death March, Seven deadly sins, The beginning after the end, Invincible, Fate, Danmachi, Pokemon, Tales of Demons and Gods, Kingdom hearts, Against the Gods, DxD, One piece, Marvel, DC, Tokyo Ghoul, So, I'm a spider, so what?, Crossover world(Final world).

Just keep in mind that this might change later and that this might not be the exact order of the worlds, plus if I find it necessary some worlds will just get way more chapters than others.