What do you think it is about the idea of a threesome that turns Blaine on? Does he fantasize about having the focus on himself, Kurt, or the third?
Maybe it's on himself. Maybe he's undone by the thought of surrendering to that much attention. He likes being on display for Kurt; something about being vulnerable in that way turns him on. I could see your Blaine getting a huge high from taking that to a new edge -- naked in front of a third while simultaneously utterly protected by Kurt. It's the presence of both elements that does it for him. (Though I think he wouldn't go for any bondage or kink in that scenario. That's too private.)
Maybe he loves the idea of orchestrating the scene as a gift for Kurt -- Kurt who's still, always, just a little surprised when someone desires him. Maybe he imagines instructing someone else how best to please Kurt: verbal proof of how closely he pays attention, and how well he knows and can take care of his boyfriend.
Or maybe he gets off on the exhibitionism. He knows that what he shares with Kurt is rare and fine, and sometimes it just brims over and he wants to whoop, "Look! Look at this thing we have, how special it is, how perfectly we fit." He wants someone else to see that and -- not be jealous, exactly, but -- marvel? But in generous moods, he knows the two of them could make someone else feel amazing, and, well, Blaine likes making people feel amazing. Blaine's boldness and warmth, Kurt's gentleness and generosity...their ability to work in tandem...it would be a hell of a gift to share.
This random pre-Glee pondering brought to you by photoshoots of Harry Shum.
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Maybe it's on himself. Maybe he's undone by the thought of surrendering to that much attention. He likes being on display for Kurt; something about being vulnerable in that way turns him on. I could see your Blaine getting a huge high from taking that to a new edge -- naked in front of a third while simultaneously utterly protected by Kurt. It's the presence of both elements that does it for him. (Though I think he wouldn't go for any bondage or kink in that scenario. That's too private.)
Maybe he loves the idea of orchestrating the scene as a gift for Kurt -- Kurt who's still, always, just a little surprised when someone desires him. Maybe he imagines instructing someone else how best to please Kurt: verbal proof of how closely he pays attention, and how well he knows and can take care of his boyfriend.
Or maybe he gets off on the exhibitionism. He knows that what he shares with Kurt is rare and fine, and sometimes it just brims over and he wants to whoop, "Look! Look at this thing we have, how special it is, how perfectly we fit." He wants someone else to see that and -- not be jealous, exactly, but -- marvel? But in generous moods, he knows the two of them could make someone else feel amazing, and, well, Blaine likes making people feel amazing. Blaine's boldness and warmth, Kurt's gentleness and generosity...their ability to work in tandem...it would be a hell of a gift to share.
This random pre-Glee pondering brought to you by photoshoots of Harry Shum.