To be fair, at that point he hadn't really built up such a fondness for him - and didn't really have the emotional capacity he has now either.

The Master grins, pulling back just enough to face Andrew (he wants to see his expression for this) and wordlessly takes his hand, pulling it up and placing Andrew's fingertips on his own throat, just beneath his jaw. After this somewhat intense (and breathless) reunion, his pulse is thumping quite noticably. There are all kinds of little signs to pick up on, really.