i tried all the option, as i said probably the problem is that i did this BEFORE obtaining the heart
yeeees, it's a little tricky sometimes. :D I also get confused occasionally by stuffs like this, I either pay extra focus on the descriptions or just hit up Lustful Desires Wikipage and these are solved all the time. I also never experienced bugs in the game too, it just needs a different way of thinking and sometimes RNG can play a cruel joke on us too. I thought I can't approach Ste's home because of a bug for the first time, I chose go around like 50 times and it turned out findig his house has a 10% chance.
For the bonding talk with Othra too I had to finish specific events and and wait a day or two for it to appear in her dialogue box. Anyways, if you are just progress the game, things will unlock themselves anyways.