"Don't need to chew ice cream," he observed, ever the helpful person. He spooned some in his mouth and shrugged at the question. He didn't know. The problem was the lack of communication. Steve didn't know where the line was here. Even if relationships like this existed back during the war, he certainly didn't take part in one.

So basically, he was keeping it fluid because he didn't know any better.

Steve smiled slightly when Tony leaned against him and teased, "Well, you're so fragile. I didn't want you to fall apart."