The 19 year-old had little regard for defence as he plunged forward at every opportunity until the referee stepped in just over two minutes into the fight.
With his famous father by his side, Benn took everything in his stride and now looks set for a busy 2016 in the UK 140 pound ranks.
Earlier, world champion Lee Selby recovered from a second round knockdown, the first ever in his boxing career, to out-point mandatory challenger Eric Hunter.
The Welshman used his superior boxing skills to frustrate Hunter, who was warned by referee Marcus McDonnell for the use of some roughhouse tactics.
At the end of the contest, judges carded 116-110 (twice, the same as WBN) and 115-111 to ensure Selby kept a firm grip on his IBF featherweight belt.
In chief support, George Groves made light work of David Brophy to end the Scotsman’s undefeated run and move closer to a fourth world title shot.
‘The Saint’ earned a fringe version of the WBA title with a fourth round victory having won every session of an apparent mismatch.