There Is Nothing.

Kyle was shocked by what happened but he expected this to happen a lot sooner even though she had cheated on her husband.

Kyle didn't care much about her as this was not his concern, he owed her husband no loyalty, and that was entirely up to her. 

Kyle was glad he didn't fuck her otherwise it; doing so would have weighed on his conscience a lot more, but they had crossed a line that couldn't be undone.

Kyle noticed she wasn't added to his harem so this was done with no emotional attachment.

This meant that she either liked her husband or she didn't need to feel anything to have sex with another person.

The latter was a more feasible possibility, he noticed that there was something wrong with her but he was glad that the situation was over.

"That was close…" Kyle thought to himself but the taste of her breastmilk still lingered alongside his throbbing erection.