"Ah, What A Fine Day For Another H-Work featuring a Sexy Onee-San!"
EDIT: I also sense a good bit of "Ara Ara" around her. ðŸ§ðŸ‘ŒðŸ·
Fu-Fu-Fu, Indeed, Masato-kun ... a older woman (Karin-san) "Knows" things on levels you have yet to attain. And luckily for you, her special someone turned out to be you yourself ... you Lucky Bastard (GRR)!