Talmud for Yevamot 10:7

בֶּן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד שֶׁבָּא עַל יְבִמְתּוֹ, וְאַחַר כָּךְ בָּא עָלֶיהָ אָחִיו שֶׁהוּא בֶן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד, פָּסַל עַל יָדוֹ. רַבִּי שִׁמְעוֹן אוֹמֵר, לֹא פָסַל:

If one (a yavam) of nine years and one day cohabited with his yevamah, and then his brother of nine years and one day cohabited with her, he (the latter) renders her unfit to him. [For this is like a ma'amar after a ma'amar, both (cohabitations) "taking."] R. Shimon says: He does not render her unfit. [For the cohabitation of a nine-year-old, according to R. Shimon, either acquires her or does not acquire her. If it acquires her, it acquires her completely, so that the cohabitation of his brother is meaningless. And if it does not acquire her, then it is as if neither he nor his brother had cohabited with her.]

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