Stating your claim

You claim you're a cock-sucker:
You are kneeling at his feet,
Should he want to invite you,
You will be his party treat;
And the party is quite private,
You are stripped of all your clothes,
He will hint 'til you arrive at,
An agreement to expose
Your skills in their perfection:
Your ability to please,
When you work on his erection,
As you wait there on your knees,
Attentive to his pleasure,
A dance with just one aim,
To relieve him of the treasure,
That a cock-sucker may claim.