Eve gaped at Allan's words, she was at a loss for what else to say. Although she knew that this was a mutual agreement, even she was the one who finally agreed to this contract marriage after previously rejecting Allan.
She was the one who gave herself to Allan that night. It's just that Eve didn't expect that this would happen so soon. Finally at the age of 19 she had to marry someone she didn't love and was even more mature than her.
Their differences are far apart, Allan is 28 years old and Eve is 19 years old. So you could say their ages were about 10 years...