You can see he keeps her turned on by making sure he keeps finger fucking her--helps with her enthusiasm to suck cock.

He was really forcing his cock into her mouth and I could tell he was getting close.

He really started growling and I got close to capture the cum shot.

Being a third party, watching at arms length, gave me a very intense sexual passion. One it felt like watching a porno film, then the sights and smells were more intense, then watching him cum all over her face. When he came I empathized with the passion he was feeling and almost felt it myself.

You will see if you look closely at the last pic where he is taking a farewell pic of Dianne, she is not only exhausted but she still hasn't wiped away his cum running out of her mouth.