I recently tapped into a porn niche that is doing rather well. My advice would be to forget about what people are searching for online. Try experimenting with taboo shit that fuckers cant get online and if they do, they have to do it secretly.
what about people fucking various household objects? guys fucking toasters, ps3 disc slots, etc and girls making dildos out of phones, xbox controllers, etc
craziest idea i could think of in the 5 seconds it took me to read your post