"I can see everything, Yuuri-san..." "I'm showing you on purpose, Sho-kun." Appearing before me, who only wanted a peaceful daily life, was an "overwhelming predator" known as my girlfriend's older sister. A desperate gap: A cruel level of curvaceous beauty that defines the younger sister as "inferior as a woman." Physical persuasion: Not with sweet words, but with trained "muscle strength, stamina, and flexibility" that tramples over reason. A calculated trap: Dripping sweat and calculated posing push a man's self-control to the breaking point. "If you can be honest, I'll give you a reward." An inescapable, high-muscle-density love. Now, the line is crossed.