Stiles licks his lips at the sight of it, thick and heavy as it lays against Derek's stomach, twitching with want. Casting his eyes up he takes in the look on Derek's face, lips parted and eyes blown with want. It makes him gleeful that he can put that look there, that he can make Derek want, want him. It's something he's wanted for awhile and only just now figured out over the last few hellish weeks.

Lowering his head, eyes still on the man's face, Stiles licks up the veined underside of his cock, taking in the texture and taste of him, teases his tongue under the crown of his dick, along the nerves there before dragging his head across the wet head. Then he wraps his long fingers around the shaft to lift it to his mouth, lips teasing over the head in a kiss before he parts them and takes the man into his mouth.

He groans softly at the heavy weight of Derek on his tongue and begins to bob his head. He's never physically done this before but he's watched enough porn to get the gist of it. Hopefully it won't be too terrible or something. On ever upward stroke of his mouth Stiles licks his tongue across the head, teasing into the slit with the tip of his tongue before going back down again, creating a low rhythm.