A sobering experience

As soon as Sarah was lay on the bench with her legs spread, Lee wasted no time in getting on the bench between her legs and giving me a close up view of his cock sinking into her now soaked pussy.
He was already puffing and panting while constantly watching his own cock going in and out of her over and over again.
The noises were obscene by now, a mixture of wet sloppy noises, their whimpers, gasps and the constant slapping of their skin as her pounded her.
The sight of his fat cock stretching her made my stomach turn even more than before and I was worried I might cum on numerous occasions.
“Where do you want it” he strained while getting harder and faster, I hadn’t even thought about this bit.
“You should have put a condom on really! You’ll have to finish inside, it’s a bit late to worry about condoms now, I don’t want any evidence on my dress” She groaned in an almost annoyed tone.
“Mmm fuck get ready” he warned, his voice showing the strain.
Then almost as if he was trying to wake me and the whole of the local population up he let out the loudest most exaggerated growl as he came. I could see his cock twitching and pulsing as it sat impaled in her used hole filling her with cum.
“Oh fuck you’re cock got big! I could tell you were going to cum ages before you actually did” Sarah panted, almost excited by the strange sensation.
Lee just collapsed between her legs for what seemed like an age before giving her a kiss and then watching as he pulled his still hard cock out.
“Wow look at all that” he blurted, almost sounding proud, “don’t watch it, that’s gross” Sarah snapped, covering herself with her hands.
They then did the awkward silent tidy up routine and called a taxi.