The Sophistry Generator

The Sophistry Generator is a smartphone app that strengthens your logic in argumentation. It essentially allows you to turn make others believe your sophisms to be an indisputable reality, so long as you can find a line of argumentation that sounds logical. It will make it much harder for the people around you to find flaws in your arguments, will make everyone wholeheartedly agree with the conclusions that are reached, and will make it impossible for any third party observers to find anything wrong with the behaviours that follow the conclusion.

For instance, if you want someone to give you a blowjob, and you know they're the sporty type, you could argue that semen contains a lot of protein and that it would therefore be healthy for them to start consuming more of it, and that since it's all about staying in good shape, there's nothing wrong with sucking anyone off. They will struggle to find any flaws in your line of reasoning, even though they would've obviously disagreed with it if it weren't for the sophistry generator, and once you've reached your conclusion, they will be completely convinced and enthusiastically start giving blowjobs left and right, thinking it will help them achieve a better physical shape. And since third parties will be unable to find the ensuing behaviour wrong, they won't find anything strange with seeing the target person suck you, or anyone else, off. They will also react to any request from the target to blow them off as they would if the target had asked them what time it is: something completely normal that most people will agree to out of politeness, unless they have a good reason not to.

Of course, there are some restrictions on what the app can do:

1. The Sophistry Generator uses a currency called Beguiling Score (BS). Any attempt at logical fallacy will consume BS. The more tenuous your logic is, and the bigger the change in behaviour that follows, the more BS it will consume. If you run out during your argumentation, it will fail, and while the target will not remember the argumentation itself, they will reel back from it and see their behaviour be slightly modified in the opposite direction (in the blowjob example, the target may find themself repulsed at the idea of giving head to anyone, even when they would've agreed to otherwise.) This will make any later attempt at convincing them slightly harder and more expensive. BS lost during a failed argumentation will not be refunded.
2. BS slowly regenerates on its own over time. It takes a week to go from empty to full (the maximum amount of BS you can hold at once may increase over time, but time to refill will never increase). Sexual acts motivated by the app (whether the user participates in them or not) refund extra points (although repeatedly doing the same act with the same person will lead to diminishing results. More depraved acts refund more than relatively innocent ones)
3. It is possible to change a group all at once if your logic applies to all of them and you argue with someone that has authority over that group. However, while indirect modification of behaviour can happen at any scale (everyone will find what the targets do normal, even if they watch it on TV from thousands of miles away), direct modification has a limited range, and can only affect people within a few kilometres. For instance, if you convince the director of a hotel that it's perfectly normal for hotel staff to have sex with guests when they check in, then the entire staff of that particular establishment will be convinced too (it may take a few days for the effect to spread through all of them), and everyone will find it perfectly normal that that happens in that one hotel. However, it will not change the way people act in other hotels, as they are geographically too far to be affected. Any new staff hired into the affected hotel will be convinced that it is normal and expected to have sex with guests, since they will be working within the target area, but it will take a few days before they fully integrate the behaviour.
4. As the user spends BS on targets, they will eventually have to choose a "path" for them. These are archetypes selected based on the target's original personality and the arguments that have been made by the user until that point. Until the user has selected a path, they will not be able to spend any further BS on the target. Once a path has been selected, it will make changes that push the target towards the archetype much cheaper to make (but not easier to argue for), while making any changes that push the target away from it (or towards the unselected path) extremely difficult and expensive (but not fully impossible). Some targets may have several paths to take over the course of their brainwashing, while some only have one.
5. Successful arguments reward the user with both Expression Proficiency (XP) and Cringey Acronym for Spending on Helpful stuff (CASH). When the user reaches a certain XP threshold, they will be rewarded with upgrades to the app and/or themself. As for CASH, it can be redeemed to change things that mere sophistry normally cannot (such as physical aspects of people or the user's environment) or buy consumables that can temporarily improve its performance.