Plot Summary

My older sister wakes me up in the morning with her tongue, stimulates my crotch under the table during meals, and even comes in the shower and gives me a hand job... It's a big nuisance! My sister, who is looking at it with cold eyes, is actually a sullen girl who is only masturbating in her room. I wonder what will happen to my life on the verge of explosion sandwiched between such an older sister and younger sister.