So, I restarted from scratch once more, and I have noticed this:
If I focus my game solely on Ferdinand, ignore everything else and make a routine of working at the flower shop, going to the 55 and visiting his house once available, then I can get the sex scene earlier (on the same day Raoul is visiting) and his route now seems to progress normally instead of gettign stuck.
I'm really sorry, I'm adding another week after April 3rd, but my progress has been very slow due to family problems.
Some of the errors you mention have been already fixed, and I'll check all the others, like the sex scene repeating (lol that must have been so weird!). Thank you so, so much for pointing out the errors so I can work on them, and thank you again for your patience.