The Doctor's sheer desperation to speak to his ex.

Did you see?? There was lip wibble even!

And the Master just said he fancied the Doctor, better get a body that the Doctor fancies

Cuz he knows him obv and the whole pretty 'n' young ("and strong") fetish.

But yeah, that "no rest for the wicked" line/scene? Could watch that for days. When Ten is all kneeling down in front of him and the Jacobi gets right up in his grill. Oh dear god *flails*