Two people who became siblings after their parents remarried. The teenage younger brother can't suppress his sexual desire. At first, she was just helping him masturbate... "Big sister, are you going out with that guy?" "I won't give my big sister to you!" From the younger brother's jealousy, the two of them somehow crossed the line, but when the younger brother faced difficulties, he tried to give up on their relationship. "If you're not brave, drink my big sister's piss!" The sister's exploding emotions, and then forced creampie... 'Sumire-nee-chan's smile is the cutest and has amazing destructive power!' And 'she's slender, fair-skinned, and her nipples are pink!' If you suddenly had to live under the same roof with such a big sister...
Hiyoko
