Modern AU where Shen Yuan accidentally sugar-daddies everyone.
So for the purposes of this, Shen Yuan's family is basically $10 Bananas levels of cluelessly rich. Shen Yuan has almost never had to look at the prices of anything he wants. He and his siblings all get an allowance from the family's main account, which increases when they reach adulthood, and in the interest of fairness his parents made it all the same size. So Shen Yuan gets the same amount of money for his daily living expenses as his older brothers with their penthouse apartments and vacation homes and private jets, at least from the family account (since he doesn't work, he doesn't actually make as much as them in total because they earn more on top of their allowances).
And the thing is, Shen Yuan genuinely just lives a lot more humbly. He likes people but what would he do with a vacation house? Anything really nice would probably require him to fly to get out there, and he gets sick as hell on planes. Living in the central city is also not great for him, because the air pollution is so bad. Having a whole house to himself would also be ridiculous. So he has a reasonable apartment, in a reasonable area, and he splurges every so often on purchases that make him happy and take-out food that he likes, and of course he pays a cleaning service to come in twice a week. Most people assume he's comfortably middle class and has some tech job he does from home, but he's been getting a lot more than he's been spending in his monthly allowances for years now, and the figures are big.
Enter into this environment author Airplane and his trash novels. Novels, multiple, because in this AU there's no PIDW, and instead after some alternate PIDW prototype got popular in the harem genre, Airplane decided to churn out a series of copy-paste shorter stories rather than recycling the same subplots in one massively long epic.
Shen Yuan of course discovers Airplane's writing and becomes as obsessed with it as ever, except this time he notices that if there are delays between new stories, they seem to clear up faster whenever he throws some cash at the problem. And also that the drops in Airplane's writing quality coincide with times when Shen Yuan was having health issues and not keeping up with his VIP purchases. So, he works out that Airplane's probably doing the writing for the money, and that when Peerless Cucumber isn't paying the most for it, Airplane starts listening to the other buffoons in the comment section more to try and entice them to pay his bills instead.
Peerless Cucumber leaves a comment on one of Airplane's latest stories that kicks off the two of them actually chatting, and Shen Yuan eventually gets to the point of offering to fund all Airplane's writing, in exchange for Airplane not doing his crap sellout stuff to appeal to other readers anymore. Airplane thinks he's joking or maybe mocking him. Shen Yuan asks how much it would cost. Airplane fires off a ridiculous number. Shen Yuan doesn't even blink and wires him the first payment. Then he gets annoyed because Airplane leaves him on read for a while, but that's because Airplane is staring at his account balance in shock.
Of course, it's Airplane who starts referring to Peerless Cucumber as his sugar daddy. Shen Yuan is just like "based on your sex scenes I don't think anyone would pay you for that" and Airplane's all "but you WOULD pay for my sex scenes ^_~" and Shen Yuan's like "technically I am actually paying you not to write that shit" and so on. Usual banter. The quality of Airplane's writing improves dramatically, a lot of his readership drops off but he does get new readers and gradually builds up an even bigger fanbase than before, and so on, it all goes pretty well. He eventually writes a few things that take off to the point of getting physical publications and international translations. Technically Airplane no longer needs Shen Yuan to pay all of his bills by that point but he's not going to tell Shen Yuan that! The contract's still good as long as he keeps writing!
Then one of Airplane's online acquaintances runs into some financial trouble and asks for help.