I feel like she's interested in Bolt somewhat. I dont think Kishimoto would have her follow him around for no reason, but theres not a big emphasis on it at this point. As for Mitsuki, I dont see him as a character that would be involved in romance.. He reminds me of an early shippudden Sai, he analyzes people and critiques them based off of the average stereotypes because he doesnt have the normal social skills/manners that most have. This kinda makes me believe that he could actually be an experiment kid also