Absolutely no cause for worry. The cushion is a soft material and has no abrasive on it. Typically humidity causes the satin/silk/cotton on the cushion to stick to the watch. It may be best to keep a tiny ( really tiny) packet of silica get inside your watch box to prevent this. Whenever the silica gel changes color ( basically it will lose color) it is time to change the packet.
The watch sapphire crystal will have no risk of damage.
Moral of the story : Wear your watch often...
regds.

What a way to start the day with pure, perfect clean lines!
Danke!
Stephen