Behavior Question

[lgallagher]

Ok so I haven't yet had a chance to have Sophia sexed yet, but I know did have Eddie and he is definitely a boy.

Now that they have bonded, I am noticing a new behavior between them. When they are preening each other, they start placing their wings over top of the other bird and they switch off.

Is this normal behavior and what does it mean? I hope someone can explain it to me please.