[Sundae]

I've seen the photo of Megan Stammers and Jeremy Forrest below and they are described as arm in arm. On more than one source.

Now when I've read this phrase before I have always pictured one person with their arm crooked and the other person with their arm slipped through. In a m/f coupling it will usually be the female who "takes" the man's arm, as he is usually taller.

I would identify this photo as having their arms around eachother. I'm puzzled.

For anyone who isn't aware of the story it's a 15 yo British schoolgirl on the run in France with her 30yo maths teacher.