I kind of love the way the gender roles are reversed in the staging here.
Normally it’s the guy looking ardently at the girl while she looks away, focused on her own issues and not on sex. The camera’s eye is almost always on her head on, because she’s the one who needs convincing. The (male) audience can put themselves in his place and delight in the way she comes around/is convinced into sex/consents to having that shy innocence displayed in that moment plundered. Only we’re seeing her point of view of his vulnerability/reluctance.
And then the SECOND ONE where she’s behind him and pulling his head back to kiss her, when it’s always, always the woman in the front getting pulled around into a kiss by the man. The person behind is dominant, taller, controlling the interaction (look at the hand on his neck), the one who has the freedom of movement and thus must take the initiative. The person in front is physically vulnerable, submissive, forced into an awkward position that leaves them off-balance and easily physically controlled.
Who cares what you ship? You can’t help but love this blocking!
[Also, why the hell is quintessential horny teenage ‘nice guy’ Stiles always feminized in fic, when in canon Derek is basically the girl in a romance novel whenever he’s not acrobatically clawing someone?]