"Absolutely not," he promises Ianto, his eyes twinkling, because whatever Spike prefers, he's never been able to keep away from the innuendo. He watches Ianto finally pot some balls, scrutinising every time Ianto bends over for any delicious signs of discomfort.
And pointedly ignores Spike's insult. Spike will get what's coming to him when they eventually face each other round the table.
(Or not, because he's likely to get just as distracted by Ianto as Ianto is, if not more so.)