Sisterly Lust is one I quite like, though I've never played Life With Mary.
These might not all fit exactly, but they're in the area of which I think SL hits
Sister Sister Sister - This one has renders that I think are lower quality, but its interesting in its own way with possibly as much sexual content
Perverted Hotel - This one is pretty fun, a bit slow to update, but the developer recently joined us on the hub and they seem pretty dedicated to this.
Parental Love - This is pretty much Sisterly Lust, only you play as the father, and I kinda like the plot a little more. That's saying something since I'm more into sisters than daughters.
My Sweet Neighbors - This is another one I really quite like, it's not as broad as SL, with only two sexual interests as of my last playing, but still quite fun.
Long Live the Princess - This is a great game that's a lot more involved than some of these others, even took a little inspiration from it for my own game, but it has as many options as SL. It's moving a little slower, but it is pretty interesting.
Family Values - I admit I haven't come back to this one yet, mostly just because I've been busy though, however it's another father thing with 3 daughters and other characters. It was looking interesting when I last played though.
Depraved Awakening - I like everything about this game. It's heavily story based but finds a way to bring the sex in as much as possible. I always look forward to playing.
Babysitter - This one might be my favorite VN at the moment. Though it is always in competition with Depraved Awakening. The writing is always awesome, in fact, their writer is who I go to when I need to bounce ideas off someone, so this is definitely worth your time.