That wasn't quite what Theo meant, but then again he was freaking out about this a little bit, which was unusual for him.
He was startled at how sudden Greg's comment was. although - "I appreciate your honesty" - he managed before Greg leant in. He was sightly unsure as to what that meant that Greg wanted out of this... relationship. He'd already shown that he didn't mind sex for the sake of it, but if that was all that Greg wanted and Theo was being led to believe that there was more between them, well, he wasn't going to be happy.
Still, he couldn't help the small mew as Greg licked at his skin, shivering the way Greg had hoped he would and, well, he was already pressed close against the other boy. "Hm, I'll have to make that silencing charm permanent then."