The girl lies on her back. The dude straddles her, with his piece in her mouth. He then goes at it, slamming her face until she can take it no more.
Named for the deprived area of Hertford in which it is most common, literally tens of B-squareds, as they are known, occur every week in Bengeo.
A girl giving a Bengeo Blowjob can derive no satisfaction whatsoever from the act.