@ BoobTwinkler Pretty sure its just refering to her leaning to one side to sleep on the girls shoulder- and the girl only wanting her to lean to that side not the other way as we saw. Its wordplay as you said- making us think its refering to a 1 sided relationship but its not at all imo- just the leaning lol.
That actually could be right, come to think of it. oO
I was under the impression that the girl at the end was actually putting the OLs head on her shoulder on purpose the whole time thus revealing her unseen actions and motive. On top of the wordplay.