Amon was not going to hold back on Shiana anymore, his mouth touched her pussy lips and his tongue assaulted her clit.
Shiana moaned loudly as she felt a pleasuring shock run through her whole body because of Amon's action, she arched her back trying to push her crotch deeper into Amon's mouth.
Seeing that Shiana liked it a little rough, Amon increased the intensity of his actions, Amon's experience in pleasuring multiple women has made him learn a lot about what a woman wants.
When he is pleasuring them, he likes to see how they react to his actions, if the reaction is big and advancing it means they like what he is doing and he then follows up with it, if they like it intense he increases the intensity and if they like it soft he doesn't try to change much and focus on a much more sensual experience.
And from what Shiana has shown, he likes it a little intense.