28 Caught masturbating; spanked in front of sisters, then carpet beating

My sister Lila caught me jerking off.
She told Mom.
Mom made me stroke my penis while my other sisters watched and Lila spanked my bottom. 

Then it was Mom's turn.
She had me strip naked and get on my hands and knees on the floor, with my sisters getting a good view behind me, and she blistered my bottom with a carpet beater.