[ Derek is vaguely aware of the sound that Isaac makes, low and offended, and he figures he's probably covered his eyes or is making a shitty face at the two of them. But he can't really bring himself to care, because Stiles' mouth is just as soft as it looks and the kiss is slow and easy, not something he ever expected to happen with a stranger. It's like they've done this before, and it's more than a little addicting.
However, it's over too quickly, and he's silently disgruntled about it before Stiles is moving in to kiss him again. Then a low, contented sound leaves him, rumbling at the back of his throat as he slides his hand up to actually cup his face.
The moment he feels Stiles' lips part a bit more, his hand at the small of his back slides around so he can hook his arm around him and draw him a little closer. There's a tentative moment where he opens his mouth against his, but then he decides that it's permission enough-- and teases his tongue forward, into Stiles' mouth. ]
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However, it's over too quickly, and he's silently disgruntled about it before Stiles is moving in to kiss him again. Then a low, contented sound leaves him, rumbling at the back of his throat as he slides his hand up to actually cup his face.
The moment he feels Stiles' lips part a bit more, his hand at the small of his back slides around so he can hook his arm around him and draw him a little closer. There's a tentative moment where he opens his mouth against his, but then he decides that it's permission enough-- and teases his tongue forward, into Stiles' mouth. ]