I would like to play the younger spoiled brother and this doesn't make the older brother/sister satisfied. Finally, the summer holiday arrives, and the parents leave for vacation. The older sibling (brother or sister) thinks that it's time to put the spoiled boy into place.
One version of it is that from the huge amount of being spoiled, my character would be seen as a feminine boy / brat by the sibling, and the sibling would try to turn him into a girl and make him wear girls' clothes and do girly stuff.
Another version would be normal domination.
PM me if you are interested.