Taiichirou's looking so smooth with his expression/rizz that while Maria may be a mother and assassin first, she's still a woman, and can't help but feel butterflies/attraction to her ex-husband, whom she still loves dearly. This is so fucking cute lol, especially since so many people were convinced that Maria has become nothing but a monster, unable to feel things like love, affection, etc. while she's over here blushing like a middle schooler over her crush, like a true maiden-in-love 🥰
Up until now, I was pretty okay with Maria not getting back together with her husband after everything is over at the end, seeing as this is just not that kind of story, but what with the husband's recent involvement in the plot, and Maria's increasingly flustered sides we're getting to see directly because of him, I really want them to still continue being spouses, maybe even try for another child (even though it may be difficult for Maria since she's 37, but with modern medicine, it's not an impossibility), since one of the biggest grievances from Maria during the separation was that she couldn't understand how they could continue being a family even though Kiri-kun wasn't here anymore.
Someone mentioned the prospect of Maria starting an orphanage after the revenge is complete and that sounds like a good idea to me. "Maria's Orphanage." I really like the sound of that. She can run it together with her husband, thus living out her happy ending in peace and in loving memory of her son Kiri-kun.