Ah, Kaya-nee. Her and Kiliu's Arai-san are probably the most unfaithful women in ALL of hentai. To be fair, Arai-san is basically retarded. Kaya-nee is just a slut. XD
Please don't translate it randomly, the ML calls the FM older sister kaya(カヤ姉).older sister kaya.older sister kaya.older sister kaya.older sister kaya.older sister kaya.