Perfectly Posed

A certain slut needs little time to come,
But she needs the permission; so she'll perch
Upon the edge until her clit is numb,
And her voice hoarse with begging; she won't lurch
Across the line he's set in stone, not sand;
She will not, cannot, shall not come without
His word, soft voiced, issued as a command -
A whisper in her ear - that seems a shout,
Because it echoes in her mind and sends
Strong signals as it drives her harder still
Towards the goal she's set and soon intends
To reach, because a slut so needs her fill;
So, with her mouth open and her eyes closed,
She comes at last for sir, perfectly posed.