The boy could react in different ways. At first, he may be shy and keep to himself. But as the girls start having fun, he might loosen up and start laughing along with them. He might also feel a bit awkward when they start talking about girl - stuff like crushes, but he could still be polite and listen.
Maybe the character, when realizing they are stuck in the sexy costume, tries to imitate different animals that might get stuck in small spaces. For example, wiggling like a worm or hopping like a bunny while still in the costume, which would be quite hilarious.
It could be about someone who is 'stuck' during Christmas. Maybe they're stuck in a snowstorm and have an adventure trying to get home for Christmas. Or perhaps they're stuck in a small town and discover the true meaning of Christmas there.
One idea is that a child is stuck in a Christmas tree lot. He got lost while his family was picking out a tree. As he's stuck there, he befriends the lot owner and learns about the hard work that goes into getting Christmas trees ready for families. In the end, his family finds him and they have a great Christmas with a special tree.
In this fanfic, Hermione would jump into action. She'd make lists of possible causes and solutions. She might consult with other intelligent characters like Luna Lovegood or Professor Flitwick. Ron would be the emotional support for Harry. He'd try to make Harry comfortable in his owl form, bringing him food and making sure he has a safe place to stay. And then there are the other students. Some might be scared of Harry in his new form, while others might be fascinated and want to study him. The teachers would have different reactions too. McGonagall, being an animagus herself, might have some insights but also be strict about the situation, while Trelawney might predict all sorts of wild things about Harry's future as an owl.
Well, Hermione would be the first to take action. She'd be using her extensive knowledge of magic to try and find a solution. She might even come up with some complex spells or potions to try and break the loop. Ron would be a bit more laid - back, but still worried. He'd be there for Harry, listening to him talk about his experiences in the loop each time. Luna would have some really interesting and out - of - the - box ideas. She might suggest things like looking for invisible time - bending creatures or using her own unique brand of magic to disrupt the loop. His friends would all come together, each bringing their own strengths, to try and get Harry out of this strange situation.