In photo its me, girl, and then guy (who is my friend). What is meaning if he reaches hand over her to place on my shoulder in photo?

So I'm at a party and I'm taking a photo eith my guy friend and his girlfriend. We are position with me on right and him on left with her in between. Does it mean anything if he places his hand on my shoulder over her in the photo? Like he reached over and he had it on her shoulder for second, but then moved it to mine when photo is taken.

In photo its me, girl, and then guy (who is my friend). What is meaning if he reaches hand over her to place on my shoulder in photo?
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