(Infinite-level stories take too much brainpower, so here's some mindless, unrestrained spicy stuff.)
[Spoiled, irresistible bottom x all sorts of devoted tops]
Qiu Nian grew up in an orphanage. He's a pretty, delicate little dummy who is always being bullied.
After an accidental death, he gets bound to the Villain Cannon Fodder System.
[In every world, there are people who are greedy, vain, and wicked. They serve as stepping stones for the protagonists' growth: universally hated cannon fodder whose ends are tragic.]
[Congratulations, you have been bound to the Villain Cannon Fodder System.]
Qiu Nian: Boohoo, I don't want to be cannon fodder.
World One: The fake young master who despises the poor in a wealthy-family wish-fulfillment novel
[You are the fake young master, switched at birth into a wealthy family. After your identity is exposed, you can't bear to lose your status, so you constantly target the real young master and manufacture scandals about him. You compete with your brothers for the family fortune and flit between heirs of other wealthy families, hoping to climb the social ladder. In the end, your greedy true nature is exposed, everyone turns against you, and you die miserably.]
Qiu Nian tries hard to play the fake young master who despises the poor. One day, he steps on the real young master's abs and sneers at him for being poor and unfashionable; the next, he steals his older brothers' expensive clothes and spacious rooms.
But the favored sons of heaven look at Qiu Nian with increasing ardor. Even the real young master strays from the plot, holding him at night and begging to be his one and only dog.
World Two: The flirtatious omega who pretends to be an alpha and deceives everyone
[You are a poor omega whose defective gland makes it impossible for you to be permanently marked. You disguise yourself as an alpha and enter military academy. To get more resources, you use your good looks to seduce people everywhere, playing with the feelings of these privileged alpha sons. In the end, you betray the Alliance, get exiled to a remote planet, and are devoured by the xenomorphs.]
Qiu Nian follows the plot as best he can, seducing countless nice older guys. Every day, he carries a different scent of pheromones on him.
After his identity is exposed, the alphas mark him again and again in desperation. Even the terrifying xenomorph winds its tentacles around him. But no one can mark him permanently, and they can only beg him not to leave like defeated losers.
World Three: The mediocre, jealous, wicked junior disciple in a cultivation world
[You are the youngest disciple of the head of the Yunshan Sect. Though your looks are unparalleled, your talent is mediocre, and you envy your senior brothers. You keep stealing the fruits of their cultivation and even try to rip out a senior brother's spiritual root. In the end, the sect casts you aside, leaving you to fend for yourself in a demon's lair, where you become a lowly cultivation cauldron.]
Qiu Nian earnestly bullies his fellow disciples, acting spoiled and behaving rudely toward his senior brothers.
But his senior brothers compete to teach him swordsmanship by guiding his hand, and his master takes him in and keeps him close to prevent anyone from bullying him. When he accidentally falls into a demon's lair, even the fearsome Demon Venerable from the rumors kneels before him and licks him.
World Four: A greedy NPC who bullies players in an infinite world
World Five: A pretty-faced traitor who seduces monsters everywhere in the apocalypse
World Six: A fallen angel with a scandalous private life in a Western fantasy world
World Seven: An irresponsible AI butler with many masters at once in a galactic world
Theme: Love yourself