She was always afraid of lowering her face into the water and inhale through the snorkel, so her Master decided she has to pass this training. They dived into the pool with company of friends, who have fooling around with gasmasks and long hoses. The Rubberbitch had the order to lower her face under the surface and stay there breathing through the tube for at least a minute. What was her surprise when the crotch zip of her latex catsuit was opened and the huge cock of her Master has penetrated her pussy from behind... It definitly stimulated her to breath deeper!