Very short. Full of spoilers. Rory/Doctor Friendship. Enjoy.
Rory frowned, following the Doctor with this gaze as the timelord pranced around the console. "so what you're saying is that we named our daughter after our daughter?"
"Yes Rory. Mels and River are essentially the same person. The same existence if you wish. We know that River is your daughter ergo-" he spun to face Rory, leaning back carefully onto the controls to avoid pressing buttons, "Mels is your daughter"
His brow creased again, "Mels told Amy I like her."
The Doctor nodded and then it was his turn to frown. "Wait, what? Tell me this story. I haven't heard this one before."
"Not important Doctor. I'm trying to get this" Rory started to pace, watched on patiently by the Doctor "By River and Mels being the same person, not only did she name herself; she effectively brought herself into existence. By having that conversation with Amy and me, she made it that Amy knew I liked her and then well…" He looked at the doctor, "You know what happens next." He began to pace again. "If it weren't for her I would never have had the guts to tell Amy I liked her and Amy would never have known that I did. So without Mels, River would never have existed." He stopped and turned to the Doctor. "Right?"
A hearty slap on the shoulder and a chuckle told him was, "Roranicus Pondicus, my favourite Roman and believe me I've met a few. You are absolutely correct. Aren't paradoxes fun?"
Rory slumped into the chair at the edge of the main frame. "Time travel is confusing."
The Doctor laughed, "Believe me, I know."