Try My Bully is My Lover. It has a reference to Eternum and is overall a good game. Do remember to play Sicae before it tho. The stories are connected.
already done, my bully is my lover, and once in a lifetime
Then go for Companion of Darkness by Berkili4. It's my favourite after Eternum. And if you haven't played Sicae do so too.
Definitely in my top 5! Great recommendation ready for it's next update too!