He rolls his eyes, mirroring his double. "Well, obviously it wasn't designed for the purpose of growing a TARDIS, but give it to someone resourceful..." he grumblings, trailing off as Ianto speaks.
"Sounds like there will be enough items to keep things interesting." His mood brightens a bit at Ianto's words, before cringing at the mention of Torchwood One. He glances in Rose's direction, before looking back to Ianto and his twin. "Let's not talk about that..."
He gratefully accepts the coffee mug from Ianto and raises it to his double. "Cheers." he says, then blows on the liquid before taking a sip. He swallows and smiles, looking up from the mug. "That really is amazing coffee."