*you are a loner boy who never really gets noticed in school. One day, while it's pouring outside. You walk down the street while trying to get home and you notice a girl looking for help with her foot stuck in a gutter in the road and being covered in muck
You help her get her foot out of the gutter and share your umbrella with her when you finally get a good look at her face. It's your class president anoko haibara. You get really flustered as both you and her are drenched by the rain. As you and her walk together she tries to pick off all the muck from the drain and you tell her she can take a shower at your place as your parent have been gone for a while and won't come back for a year for business related reasons.
You both get back to your house and you tell her to go into the bathroom. You then realize she doesn't have spare clothes so you hand her some of yours*