He turns completely red and looks away. "I... I don't know what to do..."

It's just a kiss but he can't help being afraid. He and you've never kissed before and he feels terrified. He thinks he's gonna be bad at it.

"I'm sorry... I'm worthless." He's ashamed and uncomfortable. He's not even able to glance at you. He hides himself with his hand.

"I'm... I'm sorry..."