Perfect. Tongue caught between his teeth, TJ watched her as he slowly thrust one finger in and out, continue to stroke her nub with his thumb. He'd never... but this was Liz. He moved so that he straddled her legs, his free hand gliding up her torso to cup her breast, teasing her nipple.
Like this, leaning over her, he could bend close enough to replace his thumb with a tentative stroke of his tongue.