Yuriko decided that she would surprise Chiharu. Her hands went to her bosom and she began groping them.
Later it was time for dinner. Chiharu called Yuriko to come down. When she saw her sister she was shocked. Yuriko's breasts were D-cup size. Her shirt looked tight on her body.
'How did Yuriko's breasts grow? She wasn't that big at all this morning?' Chiharu wondered.
Yuriko could tell that Chiharu was shocked. She knew why but pretended not to know. "Chiharu is something the matter?" Yuriko asked.
"N-No! Nothing wrong!" Chiharu stuttered.
The two ate dinner in silence. Chiharu tried her best not to look at her sister's bosom. She was still wondering how Yuriko had gotten to her size in one day. Yuriko spent dinner pretending to be oblivious of her actions of pressing her breasts against the table or pulling her shirt collar down and showing her forming cleavage.
After dinner Yuriko went to her room. "That was great! Chiharu was totally surprised! Now to make the surprise continue." Yuriko said as her hands went to her bosom again.
Hours later it was time for bed. Yuriko went to say goodnight to Chiharu. When Chiharu looked at her sister she was shocked to see that Yuriko's breasts were F-cup size. Her shirt was on the verge of tearing.
'Yuriko's as big as me!' Chiharu thought.
Yuriko saw Chiharu's shocked expression and smiled to herself.
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