Konpeitō wanted to ask Serena if she bet he couldn't take on her species, but not only would that be disrespectful, he had passed that phase. When he first got his species-shifting powers, he loved going through every species he could think of. The fun of that had quickly worn off.
Also, Konpeitō mostly wanted to ask what made him seem bisexual. After a somber nod to acknowledge Serena's late mother, he kept with the flow of the conversation. "I wish I could control that and open myself up to more options. I tried to see if I swung both ways, but that left me... It was uncomfortable. I'm firmly into men with a specific disposition." He let out a little laugh. "This is more proof that you'll find an S.O. before me."
Also, Konpeitō mostly wanted to ask what made him seem bisexual. After a somber nod to acknowledge Serena's late mother, he kept with the flow of the conversation. "I wish I could control that and open myself up to more options. I tried to see if I swung both ways, but that left me... It was uncomfortable. I'm firmly into men with a specific disposition." He let out a little laugh. "This is more proof that you'll find an S.O. before me."