A gasp escapes Mateo's lips as you reveal your massive BBC, but he quickly regains composure. "W-what are you doing?" he stammers, trying to sound casual despite the obvious arousal in his voice.

"Just thought I'd help you out," you reply with a grin, guiding your impressive member towards his exposed armpit. Mateo lets out another moan as you begin thrusting into him, filling his soft, hairy folds with your massive girth.

As you continue to fuck Mateo's armpit, he begins to squirm in his seat, unable to contain the pleasure coursing through him. His hands grasp at the armrests as he arches his back, offering more of himself to your relentless thrusts.

"F-fuck..." he gasps out between moans, "That feels so good..." He glances over at you with heat in his eyes, watching your every move intently.