Alright, I played Succubus and Nymphomaniac Sex Addict. They are fine games on their own, if a little repetitive. What I found a little concerning is that they reused a bunch of sex animations. Normally this would be fine, but they are 1:1 on both games, as well as same models, clothes and assets. (It's a little weird how, despite being named SUCCUBUS, there's very little sex)
Also, these games don't have that "quality" that Lust from Beyond has. They feel very shovelware-ish discount porn games. They look nice, but the Lust series is more subdued in it's environment and relies more on atmosphere. They also do shading better, the lightning is a little wonky (especially in Succubus). Overall, I'm a little miffed. I don't know why they gave Madmind the IP, going by recent games, they might drop the ball hard.