Ring gag

Lara reached into the box and grabbed a smaller piece, pulling it free of the rest. It was a steel ring with a flare on one side mounted into the middle of a strap with a system to lock it down with a small luggage lock.

She felt her throat constrict. She had sucked Glenn's dick before, and had even occasionally tried to take it deep but, ever since reading about a particular escapade in one of her books, had been slightly obsessed with the idea of being forced to suck him. The thought of having no way to stop his cock from invading her mouth set her going in a way she hadn't felt since she was a teenager.

Glenn looked at her and quirked an eyebrow with a smile. "You wanna?"

She almost said 'god, yes' but stopped.