Asking for Feedback - Regarding wearing a but plug

Hi There. Anyone able to give feedback would greatly be appreciated.

I have a six inch (6") but plug. Like to go to a meeting (informal) with it in.
Also like to go commando (will be wearing shorts).

Like to know how i would be able to cum while sitting in the meeting with my but plug in.

Will it just happen (so will the but plug be pressing on my prostate?
Do i need to "move around" while sitting to stimulate prostate, if so with a rhythm?
Is there anything/anyway else to achieve this (wearing but plug and cumming)?

Will be sitting opposite person (no table etc. in way).
Hoping to achieve this so they can (see me cumming through my shorts)
and the "wet patch with cum on" when get up to leave.

Really hoping for some feedback or input.

Thanks much.