You ask lia what to do

Lia smirks and tells you with handsigns to ignore it. You do as she says and lia goes behind your sister and tries to pin her but your sister being bigger brushes her aside, pins her and give her a karate chop on the left boob .lia shouts "ahh" and then lia indicates with handsigns pointing at your sister's crotch which was exposed as she was in the squat position right beside lia.