There is some artwork done by Amano during early stages of development that lend credence to this, the site is down now but ATMA'S Final fantasy GALLERY (
adunaph3l.net/atma) has most of amano's works on display. In it's final fantasy VII section it has a piece of artwork that depicts Aerith resting on Sephiroth's shoulder and several others pieces of the two together.
Here is the picture I saved onto my PC

Notice the how unusually happy both of them look.
You should be able to see the rest when the website starts working again.