Muscular personal trainer fucks his big ass student taking advantage of her husband's absence from class

I am hired for a special service but surprise for me to find a beautiful girl with big tits and ass who wants to get her body even more beefy in practice I teach her some new exercises and rubbing my cock with her ass I get hard and I can not help it she notices but she gets horny and I end up putting my black cock in her tight pussy until I make her moan with pleasure.