Reili
Okay, you know what'd be great, in terms of the parentage of kid number 3? Future Shiro gets current/past Shiro pregnant somehow, and Shiro takes that pregnancy back to the main timeline. Would be even more hilarious if she was visibly pregnant when she got back to the main timeline, so Lyrica and crew would wake up on the boat to Shiro suddenly having an 8-month belly bump. Given what other weird stuff Shiro has done, I wouldn't put it past her to be able to conjure up a dick for herself.