"Well of course he knows. He knows everything. He's like some kind of mind-reading super ninja. But it's really embarrassing to know that he knows... y'know?" Besides, there was fooling around and then there was intense, frantic, tear-filled, cling sex. Just thinking about it made Daniel blush.
Not to mention he had an ache in his lower back to remind him, and he could still feel Peter's release, cool and dried on his skin.