Her older sister, Yuuka, gives off the air of a nice woman from the moment she sees her. Yuuka said that she liked my appearance, and as soon as I took my eyes off her, she started seducing me. While staring at me with open eyes, I push my long tongue in and pour plenty of saliva into my body. Yuka's tongue, which is filled with moisture, is like a living thing, entwining with it, dragging it in, swallowing it both body and soul. The longer he doesn't find out about her, the more radical his immoral kisses become, and he can't stop himself from being drained...