I have the iPad Air 2 and bend just a little bit, what can I do?

You can take it in to Apple and pay for an out of warranty exchange, or you can live with it. Those are pretty much the only two options. Accidental damage is not covered under the warranty. If you have AppleCare+ you could pay and use one of your two accidental damage claims to get a replacement.

Accidental damage voids the warranty, but for a fee you can exchange your damaged device for a refurbished one. In the USA the out of warranty replacement fee for an iPad Air2 is $379.00. The refurbished replacement will have a new screen, new battery and have been fully tested - it will be like new basically. It will also re-instate the remainder of your original warranty or 90days, whichever is longer.