The reaction is immediate. Steven flushes, angry and embarrassed - that's clearly a sore spot. He suddenly finds himself doubting his transformation, wondering if he did it right, if he should have done it in the first place. Maybe he should have made himself older? Old enough that Lambert couldn't disrespect him like this!

He gets to his feet, wings spread - deadly serious, now. Or at least as deadly serious as he can look while still being an honestly adorable looking kid.

"Yeah!" he shouts back, defensively. "I bet you think you can just be a jerk to me all the time, and that nothing will ever happen, because I'm too nice to say anything! I bet it feels really great, picking on a kid!"

He lifts his left arm, which is ostensibly made entirely of vaguely crystalline vines. The vines shift, growing sharp and spreading wide, becoming a more formidable weapon.

"...But I'm not just a kid, anymore."