I thought it settled things just fine between MC and Ryuugasaki. Setting aside whether he’s open to falling in love with another guy in the first place, he is aware that MC’s feelings towards him are complicated. That comment of how long he’ll remain the girl MC first fell in love with is pretty much addressing the MC’s worries of how his own feelings could change once Ryuugasaki’s looks have faded. As much as MC tried to distance himself from Ryuugasaki, the latter also had a barrier put up to protect the two of them emotionally in such a scenario since he truly did cherish their relationship.
MC saying he was a boy but still looked pretty made Ryuugasaki so happy because it shows he’s moving on from that idealized first love in his memories to directly acknowledging Ryuugasaki as he’s always described himself; a guy who likes to look pretty. It shows that the MC has put down his emotional shield, that he’s only attracted to him because of his past complex making him think he’s a girl and that he does feel attracted to him in the present. In return, Ryuugasaki pretty much up and says that he’s willing to try falling in love with MC too if he truly wants to pursue such a relationship with him, just in his own teasing way.
All in all, whether the love is successful or not (I mean, why not, given the tone of the story) isn’t as important as the fact that they’re able to open themselves up and show their vulnerable side to the other.