Well all of Tsukinomizu feature a decent amount of Futa, though it also have a lot of tentacles, if that matter to you.
https://f95zone.to/threads/forget-me-not-gemini-fort-final-tsukinomizu-project.65603/ Probably have the most focus on futa with tentacles being secondary, where all the others games from them are more of a tentacles first futa second
https://f95zone.to/threads/lily-kni...e-crest-of-demonia-tsukinomizu-project.22576/
https://f95zone.to/threads/naedoko-demons-ground-v1-12-tsukinomizu-project.79560/ All 3 of the above got superb translations
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just a couple of days ago got fully translated (and a really good one at that too, though there is a few rough spots, that will hopefully be fixed soon)
https://f95zone.to/threads/tsukinomizu-project-the-succubus-trap-island.55076/ More or less an MTL just AFAIK (haven't tried it myself for that reason, hoping it get a proper translation in the future)
I think these are all the ones that got full english translations, and as I said all of these got a lot of tentacles and futa, though with tentacles taking a slight first place except for the forget-me-not game that have the futa part be the bigger one
Also while they are all separate stories, they do take place in the same universe, and there are some character overlap between them, so if you want to play them chronologically it would go Lily Knight saga -> Naedoko Demons Ground -> Forget-me-not -> Nightmare Girls -> The Succubus Trap Island
And well this is also the order of release, a few of them are I unsure from ingame events, as they are a bit vague in the overlaps, but since the rest follow release order, I am pretty certain it would be the chronological order too. But again it is certainly not required as the stories are completely separate apart from those few overlaps here and there