Hello! Thank you for the comment! I was worried this comic would not work as well, such as in the scenario you mentioned.
The reasoning in this case he is meeting these Fates characters for the very first time. The punchline is they are so beautiful/cute, he ends up second-guessing himself. Also a throwback to when he was ‘deceived’ by Lucina.
Hope this explains the idea behind this 4koma, and to other readers as well ^^;