Are merfolk romances not fully implemented?

[untold lichen]

I haven't been able to move past six hearts with any of the three romance options for merfolk even after achieving S rank in the ocean and all heart scenes and missions, I just want to know if I'm wasting my time right now because you can't date them yet. I thought there was a merfolk update but the wiki still says not implemented but the wiki isn't very up to date so. 🤷‍♀️

[gray flame]

You can marry and have children with the merfolk romance options.

[untold lichen]

so weird because I've been giving loved gifts for in game WEEKS but still haven't moved up in hearts for all 3 of them... might need to restart my game again.