( Jesper doesn't mind the jerk of the hips since it's an obvious reaction to what he's doing, but he doesn't mind a slower unfurling into pleasure which is why he's not immediately going to an all-out assault of stimulation to Nikolai. They haven't been caught yet, they can enjoy it. He likes a hand in his hair when he's doing this and hums around him in appreciation.
He holds Nikolai steady with his hand and starts moving on him, pulling his head off so he's only sucking on the tip before taking him all in again. His lips tighten around him on purpose and he strokes his hand every time he bobs out to give Nikolai extra stimulation. Jesper really loves blow jobs, every time he gives one it's genuinely his pleasure.)
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He holds Nikolai steady with his hand and starts moving on him, pulling his head off so he's only sucking on the tip before taking him all in again. His lips tighten around him on purpose and he strokes his hand every time he bobs out to give Nikolai extra stimulation. Jesper really loves blow jobs, every time he gives one it's genuinely his pleasure.)