I want to know how to give Othra and Rhot a lust potion.
Is this the way to raise the lust for bad ending?
I think there might be an option to give the lust potion to them, either normal or enhanced version, the lizardess that was outside of the inner temple at night inside the ruins can be given one if you have any, and the 2 lust numbers for them need to total 10 or more to get the bad ending and you need to tell the other lizards about the lake behind the gate inside the inner temple after unlocking it.
Maybe you need a certain amount of them for it to appear? If not, then it might be a bug in the game or it might require a certain version to have it be avaible, which version are you using? The Itch.io or the Patreon? the latter might have that added in all ready, but the former might not have it yet.
Version 0.15.1, which is the Patreon version, is needed for giving him and the other lizards the lust potion to have their lust meter go up, so unless you want to support him to get that version, you will have to wait until Hayo release that version on Itch.io next month i think, it was usually ever day 25 or so each month, but he is doing them near the end of each month instead.