Plot: protective "delinquent" brother and sister switch bodies with shoujo art orientated to women.
Theme: Yankees are dirty people and can't hold back from soiling their beloved sister's body if given the chance.
DMM'S English synopsis is more thought provoking than mine: "Did let you touch even a body?" Play with a nipple and a thing of there, and want to torment it if I watch an older brother getting along well with Amemiya…Do not want to hand it! !"