No, you do not intervene

You want to step forward and tell the businessman you were about to deal with the situation yourself and he need not bother himself. It is hardly serious anyway. However, you hold yourself back. The girl (assuming she is eligible to be spanked at all, she does look young) probably will not get punished too harshly and whatever she gets she brought about herself, however accidentally. Not to mention being naked and very recently spanked is hardly the best state to be in to intervene in a potential conflict; more likely you will only get into further trouble yourself.

“Oh, s-sorry, S-sir” the girl stutters. “I didn’t realise...” She hastily stops the song but it is too late. The gentleman is intent on teaching her a lesson and he angrily demands to know her age. The Rulebook helpfully suggests he will have to right to contact her parents if she is underage; if she is not, you know all too well what will happen. The girl pauses ever so slightly before responding, possibly wondering if she would get away with a lie and deciding not to find out. “Eighteen, Sir” she says in a resigned voice. The man nods with satisfaction. “Good.” He says. “I have another half a dozen stops to go and unless you want to make an appointment to visit me tomorrow you will stay over my lap for the whole time. That should teach you.” The girl gets up. Her face maintains a respectful expression as she holds onto the rail about to step across the aisle but before she does the businessman gets up too and moves to the area in front reserved for pushchairs but currently empty; the girl meekly follows. He puts down one of the flip seats on the side for himself and waits for the young offender to stand in front of him. The rack with a paddles is right above his head well within his reach.

The girl's hoodie is lifted and her jeans are opened expertly and with no fumbling. The gentleman clearly has done it many times and in one motion he pulls the jeans and underwear to her knees exposing her skinny, almost boyish butt, white and unblemished so far. She goes over his knee readily, sticking her bottom out. From your place you can see everything perfectly, as far as the girl's closed legs will allow you. The man’s hand can cover the small cheeks almost entirely and he wastes no time before starting to smack her hard and fast. Despite the rapid and relentless **** of the clearly experienced hand on her cheeks, the girl is steady and continues to offer her bottom for chastisement. Most heads are turned her way now; even though nobody has as good a view as you do, the satisfying sounds of solidly landing smacks cannot fail to attract attention.

The spanking continues uninterrupted through two stops; people get on and off (with regretful looks) but nobody requests the special needs space or demands to know what is going on. The girl is maintaining her resolve too, staying in place with seemingly no trouble. The small sounds she is making are almost entirely swallowed by the hum of the bus engine and the outside traffic noise. Her bottom does not colour in as easily as yours but nonetheless the it is changing shade under the hard-working palm. When the bus stops for the third time and the pair of cheeks are a very solid pink the disciplinarian pauses. He gives the small bottom a good feel, not quite lewdly but certainly longer than absolutely necessary and reaches over his head for the paddle.

The girl shudders visibly as she sense what her spanker is doing (she probably cannot see much in her unfortunate position) but even at her young age she knows better than to express her feelings in any more obvious way. You feel too that a paddle is a bit excessive for a disruption that was unintentional and lasted seconds anyway, but then, of course, it only lasted seconds because someone had to point out her error to her. The paddling cannot last too long given what the man said about his stop, the girl will just have to hope there is no traffic. You have already decided not to risk your bottom for her, not to mention that your rules permit unfair punishments to be challenged. The paddle in the meanwhile is lined up for the first stroke and again with no time wasted it finds its small target with a satisfying (for most people on the bus, at least) echoing crack. Robust as the girl's bottom may be, the medium-weight paddle leaves a very clear print on it. The last three stops will be very long for the careless teen.

You find you were mostly wrong very quickly. The businessman brings the paddle down three more times in a rapid succession, getting a proper howl out of the brave girl. Once he got the wanted reaction, however, he passes the paddle into his hand that rests on the girl's back and resumes spanking with an open palm. Even though the spanks are slower now the reaction is more obvious as they land on a paddle-marked behind. You can hear the whimpers that follow the smacks and the jeans-clad legs are no longer perfectly still. You think it is a good show for someone so young nonetheless, but it is over before very long. The businessman tells the girl to get up but keep her jeans and underwear down until she is getting off the bus and not to turn music on again. She gets up gingerly and apologises again with her pussy exposed to him and her reddened cheeks to the rest of the passengers; once he acknowledges her remorse, she steps to the side putting herself into the corner of the wheelchair space. A few moments later the businessman steps off. Nobody was waiting to get on and your ride home continues now with another pair of punished cheeks to join yours in offering the ladies on the bus a reminder of what happens when they misbehave.