You can run Android's desktop emulators (like Winlator) directly on your phone. This is extremely technical, performance is inconsistent, and file permissions can be complex.
HuniePop was one of the most pirated adult games of 2015. Android is the piracy capital of gaming. Because APK files (Android installation packages) are essentially zip files, they are trivially easy to crack and redistribute within hours of a release. For a small indie dev, investing months of work into an official port only to have 90% of users download a cracked APK from a forum is a terrible business model. Huniepop Android Port