That's still on my todo list. Once Season 2 is ready to be published on GOG, I'll revisit the codebase of the first season in order to update it. I don't have a specific timeline at the moment, but I'll be sure to announce any changes as soon as I've made them.
It took a while! But I found out the modified achievement wrapper GOG uses, which worked on Sisterly Lust, also work on other games. So bundling it with this latest update was a no-brainer. Happy to hear you'll purchase Season 2 as well. As soon as I have more news on a GOG release I'll let you know.