The MC ends up very happy in all of the routes so we can say all the endings are happyNot yet, Claudia's route isn't in yet that's what some of us are waiting for.
So far there are 5 routes that I know of.
Rye by far has the best route and outcome. The only one where it's a mutual relationship and you aren't dumbed down by futa sperm thanks to her drugs.
Suni's route is quite good.
Vicky's is good if you can get the money on time.
Momma Shauna's endings are the best though. She will love you forever and ever.
And then there is the Demetria path.
I also think the landlady has an ending if you fail to pay your rent but it's not a happy one.