1
He spun round and purred with satisfaction before he replied.
2
The Professor purred with satisfaction.
3
It was mostly crust and gristle, with a few stringy bits of meat mixed in, but his belly purred with satisfaction.
4
"You know where the bedrooms are in Anton's house, don't you, Davida?" Tottie said, and almost purred with satisfaction when Davida blushed two shades darker.