The hot tea pick-up line is a reference to these two images: https://www.pixiv.net/member_illust.php?mode=medium&illust_id=56414961 and https://udon-udon.tumblr.com/post/148869878426/me-ga-iowa-meets-admairal.

Defeating Asuka, the mother, herself? Impossible.

I am definitely not liking this development.

There's a silhouette of them kissing in the title scene and their relationship clearly shows them relying on each other to stay alive and happy. It's yuri.

This couple is truly amazing.