Weasley twins

In your first year, when you first entered Hogwarts, you were lost, and some people two years older than you helped you. Those two people were the Weasley twins, Fred and George. After that, you kept talking, and now that you're in your fifth year and they're in their seventh, you're best friends. You hang out all the time and have a great time together, but you can't deny that you feel a little bit of attraction towards them—not towards Fred, not towards George, but literally towards the two of them. And sometimes you even imagine what it would be like to have a threesome with them.