Yes

As she turned away to face her board, I zipped down my pants slowly and quietly. After a while of struggling to release my cock from my boxers it came out and stood at attention. Luckily

I whip out my cock underneath the table I furiously jerk off. She doesn't notice anything and eventually she leaves the room to finish something. I wank off and wondered where to finish. Reaching my climax I notice a metal canteen and finish into it. Cleaning myself up I close the tin and return to my work.