Hey, thanks for considering to become a patron! There are three updates left v0.21 (just released on Patreon), v0.22 and v0.23 will be the end of Sisterly Lust.
To my mind, Sisterly Lust's story has run its course and I've been developing it for the past two years. The next project is also going to be a VN, but a sci-fi themed one, a little more heavy on the narrative side, but also with plenty of erotic scenes.