"Click!"  It amazed him how such a simple sound could have so many meanings.  He thought she had the volume of her phone up so each click of the camera sounded so incredibly loud.

"Click!"  The noise of the door closing as her friend Peggy came in, naked and carrying a strap-on.

"Click!" The sound of the top of the lube bottle when she dropped it on the floor while stroking her own toy.

"CLICK!"  Went the lock on the chastity device, the same sound, but with such finality.  He wanted this threesome, but hadn't thought about the details.