Picture this: You have her at your house as a guest. She's the daughter of a friend of your mother's who happens to be in the area after studying abroad for a few years. You knew her from when you were both kids. Last night was getting late and you totally forgot to take the clothes out of the washing mashine - it's early in the morning and you kinda forgot she's here and she didn't lock the bathroom door. So now you're holding a small box with clothespins to hang out the laundry, open the door and see her like that. Startled, you yank up your hands and clothespins are flying everywhere, while you can't take your eyes off her delicate, yet womanly body. That's the snapshot.
Or whatever you want it to be. You've seen enough anime to know how stuff like that works.