"The cause of the couple's breakup, the first place is sexual disagreement ...?" Jun, who has just had a boyfriend, feels anxious about his technique ... Practicing with me (my brother) who lives with me! - "I don't want my boyfriend to hate me, so let me practice with my brother" From that one word, the brother-sister's cool relationship begins! - My sister tries various that I looked up on the Internet, but I shouldn't be addicted to my sister's ... There shouldn't be.... At first, I thought it was 'practice', but when I realized it, I was licking it all the time ...!