There are solutions and apps for streaming AirPlay content between Apple devices. You can beam something to a Mac or Apple TV, etc. How about streaming to Windows? That’s what Aerodrom is for.
Here’s some info from the developer’s page:
Aerodrom is an AirPlay / AirTunes receiver application for Microsoft Windows PCs. It lets you seamlessly stream audio, videos, photos, and photo slide shows from your iPhone, iPad, iPod touch or Mac and PC to your Windows PC. All devices must be on the same LAN and/or Wi-Fi network.
you can download a demo version or buy the full version from our download page. See our YouTube video of Aerodrom in action and follow the blog of funkyf@ctory development to keep track of the latest changes an check out the FAQ section or contact us if you have further questions.
As it says, there is a demo version and a full version for $10. You can download it here.