LOL! That chapter name! 5-7-5 could be taken as a pun, go-nana-go, or "Go, Nana(ko), go!" Not sure if it was the intended pun, but it works. ^_^
Oh, and @Antlas, I think that's her forearm, with her hand pinned between her chest and his arm/shoulder.
EDIT: ...and now that I'm awake I...