that's her symbol from training with tsunade, I forget what it is, but it's the same thing tsunade uses to keep her self looking young and increase her strength and healing abilities
^^ Probably not in this case. Even though they are two halves of the same beast (Beast III/R and Beast III/L) their "human" hosts don't share same relationship.
@Clueless1 Well Kiara's NP is pretty sensual (?) given how many "hands" she summons with it so I guess this might be another (non-damaging) use for it.
I mean Asuka is pretty damn assertive as is. Tomoko is just way too much of a socially awkward train wreck to ever do something like this, with her. She views Asuka like she’s on a pedestal and doesn’t consider herself worthy of touching her like this.
That symbol is a point of concentrated stored chakra (the Naruto series version of chi energy) that can be released to provide a massive boost to her healing.