Icon twins! *g*
The kiss is exactly what he needs, something both to ground him as he flails mentally at how huge the toy feels inside him and to nudge his flagging arousal back up again. He plunges into it gratefully, clean fingers tangling in Ianto's hair, sticky ones gripping his still-clothed bicep, and gradually stops trembling.
Until Ianto presses that button, and then he jerks hard, crying out. It's too soon – he's only just barely adjusted to thing – and the sensation is beyond intense. He starts shaking all over again, clinging to Ianto, sobbing into his mouth, until his body starts to realise the toy is actually only on the lowest setting and actually... actually, it feels good.