Steve was the only one that he had his eye on in any way other than trying to figure out how social interactions worked. That's what the rest of the Avengers were for, but his friend was special in a way that he couldn't completely put words to. It was something precious and filled a need inside of him that he hadn't realized existed until he had Steve to himself for the most part.

He moaned at the sudden tight grip in his hair, and his head bobbed more eagerly over Steve's length in response. He paused only long enough to suck hard, the sound of his name falling from his friend's lips like that sending a thrill down his spine. His fingers stroked the base of Steve's erection as he increased his pace with complete eagerness to please. The look that Steve gave him made his own arousal throb with need.