[ That's all the encouragement he needs to go faster, harder, pounding into the other with all the effort and precision vampire stamina can grant him, faltering occasionally due to the awkward positioning. Should've gone for the table. Next time, for sure.
Vampire stamina won't last forever though, especially not with all this hard and fast and so he makes an effort to move his hand with more enthusiasm around Ianto, teeth gritted against the strain. ]