I've been trying to get the Elite Harpy's second top-middle scene on the Pervert page, but haven't been able to. The wiki says that you gotta present your ass after getting her aroused, but every time I've done it, she instead divebombs with a specific focus on putting her dick in my mouth (and because I'm in a crouched position, she ends up missing over and over without end). Is the wiki out of date on this and there's a different method, or is the Elite Harpy just bugged? I've tried having Hiro sit on her dick in both regular & reverse cowgirl to get the scene, but those don't work either.

Finding arts recommendations are very old here. Most of characters don't have one particular method you should use to see each scene.  Better just try a bunch of scenarios you can get with the character you need and see if some anal scene has the art you need. 

You probably can make Harpy fuck you in battle, but you'll need to make her land and stay on the ground. Her divebomb means she's still staying in the air.