WULFRIC hadn't reacted yet and Aster had already walked ahead once again. Then, he suddenly realized that the other most likely said that to avert answering his question. It's very effective though.
Just looked at his reaction. His heart was still beating so hard and so fast right now. It almost felt like it would jump out of his body if he wasn't careful. If it was normal, he would have probably said, 'you can try it if you want'. But sadly, he realized that he wasn't as courageous as he thought he was. At least, not when it came to Aster.
He truly wanted to just be shameless and pull Aster to him. Wrapping his arms around his thin waist and, ahem, doing the 'criminal act' the other just said. But surprisingly enough, the moment he thought of it, his mind just blanked out and he couldn't move.