That was hot but should have been harder, perhaps a paddle or strap. I also think for further punishment for exposing himself he should be locked in a chastity cage
My MIL had no moral scruples in coming over to our place to give my butt a good whipping. She believed in performing at an empowerment ritual by sucking me off before paddling my bare ass. My wife loved watching, especially when I got my ass spanked with her hairbrush. If I was lucky she would stop with a hairbrush. Otherwise she would pull out her razor strap and really lay on the leather. Sometimes she even brighter riding crop so she could flick my back full of welts.
very erotic for him having his cock between her legs as she spanked his ass , I'd have a sticky mess to clean up off her legs if she spanked me like that