Hopefully Judy and Celia will be top priority for next update. ICSTOR has now presented 4 other girls besides Sara at school, so that's obviously TBD. Violet seems like a candidate for a future MC-Caroline-Violet threesome. If we just want to be completists, then there's the two girls at the nightclub, too, and maybe the sex shop clerk. The Aunt and her wife are likely to wind up getting impregnated, I suspect. Shuri and Zuri seem played out, but I suppose there could be a return visit. That's 17 total women/girls, including the MC's immediate family. It looks like the story is starting to pivot towards the family harem outcome. Linda and possibly Judy are likely to be the catalyst for helping make it happen.
I would like to see other characters/sex partners developed further before proceeding forward with any more progress with Linda/Sara/Caroline. It wouldn't kill the wincest fans to wait one extra update for major progress on that front, just to round out the game/storyline more fully.