Below is my contribution to @The9thCyberLegion’s Fanfic Collection thread.
Based on a few first-act scenes from everyone’s favorite Fifteenth Doctor episode, “Space Babies”, this story replaces Fifteen and Ruby with the Sixth Doctor and Peri in a time where they’re so friendly with each other that they’ve managed to produce a little Peri junior. This fic is rated G, suitable for all audiences.
Because of its length, I will leave a link rather than pasting it into the text box. If you like what you’ve read, feel free to leave a kudos and/or a comment at the bottom of the AO3 page. No account is required. Thanks! 
Great work!