While he normally welcomed her when she did this, just now it made him particularly uncomfortable. Here they were, talking about how she knew he was still in love with Lily Potter, and she was straddling his lap. He wasn't certain how he ought to respond to this. He couldn't exactly get up and leave without dumping her unceremoniously to the floor. He didn't think arousal was an appropriate response, either. So he endured it tensely, hoping she moved off either the subject or his lap.

More problematic was the fact that he was so focused on what he shouldn't be doing, he was struggling to keep up with her logic.

It was sound, he supposed. He knew she still loved the Doctor. But that was different, wasn't it? Oh, and she made it all sound so simple. He would very much have liked it to be simple. Perhaps he was over-complicating things; he had a talent for doing that.

Finally, he simply replied, "I promised you I wouldn't leave." That settled things more than any other assurances they gave one another.