On the TARDIS, the two women stood facing each other. The Doctor started to pull away, but Yaz moved closer. Brown, determined eyes met hesitant hazel. Yaz moved her hand from the Doctor's temple to her cheek, and the Doctor leaned in. Their foreheads rested together.
"Yaz, I - "
"Shush, will ya?" Fingers covered the Doctor's lips. "You're scared of the place in your thoughts where the black hole and I meet. I get that, I do. But Doctor, there are things that are worth pain. You, to me, are worth just about anythin'. I'd travel with you for a thousand years, if I could. But as it is, I just get one little life, and it is yours, you idiot. My life is wrapped around yours. And the funny thing is, I know now that you feel the same. Not to brag or anythin', but I'm massive in your head. If anything happened to me now, it would be terrible for you already. So I don't think you have much of a choice here. I'm all in. But I think you are too."
She dropped her hand from the Doctor's face and stepped back, crossing her fingers behind her back in hope. The alien stood, perfectly, inhumanly still, her forehead creased in thought. Yaz bounced a little on the balls of her feet, anxious, as her friend did what Yaz liked to think of as "emotion maths".
The TARDIS whirled through the vortex. Millenia passed, and seconds.
The Doctor's eyes opened. One side of her mouth quirked, but her eyes were intense, burning dark in the shadows of the TARDIS. She crossed the few steps between them quickly and grabbed Yaz's waist, entwining them together. Her right hand slid up to knot in the younger woman's dark hair. "My Yaz," she breathed, and kissed her.