I think it is very good to be used as the name of twins, especially the sister-brother combination.
Read it apart, the tone is very clever, and the meaning between the lines is also good. Even if it is homophonic, "implication" and "smile" are good words.
Taken together, people will know that they are brothers and sisters at a glance.
I hope I can give you an idea.
I also wish the two babies health and happiness.