Press your butt against his bulge

You turned around, lightly shaking your hips at James. He turned red immediately, shaking even more. "Huh?" Confused, he stared at your rear as you brought it against his bulge, grinding against him. "Wait, I can't fight if you get me hard like that! Mngh!" James clutched your rear, trying to pull himself free, but failed to do so. Instead, he was only grinding his member between your cheeks, cock twitching in his outfit with each moment.

PFFFFT!

A stray fart from you causes him to fall down on his ass, and you follow him, sitting down right on his member. He clutches your waist, trying to move you off of him. "If you keep doing that I'm gonna. Ah!" His cock tented to it's highest suddenly, as you felt a wet sensation come from him. "F-Fuck I pre-came! Stop I'm gonna cum for real!"