I find it fascinating that we can all watch the same show and see so many different things. It's just that from trawling through screencaps when I was doing my mammoth S2-S4 rewatch picspams, I started to notice that there are quite a few moments where Ten has a definite... 'gleam' in his eye when he's looking at Donna. And given that DT is such an amazing actor, I can't believe they're unintentional.

But then that may just as easily be my own prejudices showing.

I do love them as friends, though - I just like the odd "what if" now and then.