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After that Riko only appears for short amount of times at rare occasions.
This is more evident in the second OVA where she wonders if he would marry her if they were not blood related, and in the manga where she blushes every time another character mentions her brother, and also in the 5th OVA where after being hit by the pollen she tries to molest him while affectionately calling him "Onii-chan".
Right before he was about to tell her, she moves out of the way, just like when he confessed to her very early in the series, leading him to state "I love you" to all of the female cast with the exception of Momo, Mikan, Golden Darkness (Yami), and Haruna herself.
The ending implies that his "love" troubles will continue on into the future.
In contrast to her brother, she is very mature and does not hesitate to tease him, going as far as stating they aren't blood-related, but quickly retracting the statement, playing it off as a lie.
Mikan also seems to have a certain lack of respect for Rito because of this (she hardly ever addresses him by his honorific as an older brother), but does refer to him as "Onii-chan" as thanks for trying so hard to take care of her when she develops a fever and when he gives her a Christmas present.