[ He can probably count the times Ianto's taken charge like this on one hand, because that's the way their dynamic is, and yet those moments are the ones that stay with him the most. It takes an immense amount of trust, Spike doesn't like feeling vulnerable and yet he's nothing but vulnerable in this moment, breath heavy in his lungs and knees lifting, obedient, pliant. He grunts softly at the slick intrusion, feeling it more than he usually would. ]