This is a rather strange and inappropriate topic in general. However, if we were to look at it from a fictional and non - sexualized angle in extremely rare cases, perhaps it could be about self - discovery or challenging social norms in a very unconventional way. But most of the time, stories with such a premise are likely to be inappropriate and lack positive messages.
If a boy is forced to wear panties, the first step should be to remove him from that situation immediately. Then, it's important to provide a safe and supportive environment for him to talk about his feelings. Contacting a child psychologist or counselor can also be very helpful to deal with any potential mental trauma.
It could potentially be part of some very dark and inappropriate power - play in certain extreme and unethical fictional stories. However, this is not acceptable behavior in real life.
No, there can't be positive sides. This situation involves non - consensual actions which are unethical and can cause a great deal of emotional distress and harm to the person involved.
Rather than exploring such discomforting topics, we could look at positive travel experiences like enjoying new cultures, beautiful sceneries and friendly encounters during trips.
Forcing someone to wear something against their will is a violation of their personal autonomy. It is unethical as it disrespects the individual's right to choose what they wear.
One possible theme could be about identity. Maybe the character is forced to wear panties as part of a strange experiment or situation that makes them question who they are. Another could be about power dynamics, like who has the power to force this and how the victim tries to gain power back. But really, these are still on the edge of being inappropriate themes.