Solve the problem for Mr. Nereus

When Tammy White left, Nereus Henry was still in a daze.
Their lips separated as soon as they touched, like a dragonfly kiss touching the water. Tammy White's figure floated away, leaving Nereus Henry with an infinitely beautiful back view.
But why did she kiss herself?
Nereus Henry kept thinking about the reason, but he couldn't figure it out. In the end, he could only attribute it to his own personal charm.
No matter what the reason was, the feeling of that gentle kiss just now...