I can't tell my brother. A cuckold story of how we met and made love over and over again until we ran out of lust.

We met two years ago when my brother brought her home as his girlfriend. When my younger brother said, "I didn't believe in falling in love at first sight, but I can now believe it from today," she said to her, "...me too," and the two became united. The two have been in a secret relationship ever since then, but after marrying their older brother, she tries to end their relationship. However, the younger brother, who doesn't want to end the relationship, forcefully pushes her down! She also realized that she couldn't leave her again...