Hey, all is fair in flirting and mixed signals, yo. Jim was skilled in this game, too. That and Kirk is a weird combination of rude and stubborn with rejection (as cadet Uhura can testify).

He doesn't make the mistake of snorting again, just makes a different rude noise at "slightly" and leans against Peter a little more without realizing it, "Much obliged, rocket boots." He doesn't even notice Peter looking at his lower regions.

Although he wouldn't blame him for it. He knows he looks good.