I had wondered for some time why there was no sound in this series. Well, now I know.
Was playing Sisterly Lust. It has sound. But not for the first time I encountered strange bugs. Certain sounds that wouldn't go away ever. Sounds that played outside their designated context - e.g. sex sounds playing too soon or too late.
Given that I'd seen this before in Ren'Py scripted games, I had to conclude that it's not quite cooked when it comes to sound environments.
I wouldn't know. The last scene management scripting language I used was way back in the days of SCUMM - Scene Creation Utility for Maniac Mansion ๐ Long, long ago...and quite briefly.
But I digress. Clearly sound is a PITA for these games, sadly.