the-girl-who-was-sherlocked:

When the Ninth Doctor first asked Rose to travel through time with him and refused, the Doctor accepted that and moved on. He traveled through space and time, saving the universe, all lonely for years thinking “I wish Rose could have been here.” Eventually, he goes back to a few seconds after he left Rose and says “By the way, did I mention it also travels in time?”

Rose never knew how long the Doctor waited for her.

I think this makes sense. In the episode Rose you see all those photos of Nine at the assassination of Kennedy and at the Titanic (on his own). But also in that episode he’s checking his reflection in the mirror like he’s seeing it for the first time, so he can’t have been long regenerated. So maybe he does all that stuff in the time before he comes back and says “Did I mention, it also travels in time?”

which makes that line even more powerful because this time he would really want her to say yes, because he knows what it’s like without her.