Well The Sono Hanabira series' plot is pretty easy going slice of life stuff, mostly focused on the 2 girls' romance. IMO the sex scenes just adds some spice to it, there actually isn't much of it... Bit of character development here and there, sometimes bits of drama sprinkled around (not a drama-heavy series).

Well, I guess the romance is always present and the sex is an addon, sorta.

I have not been through this specific one but it's probably handled in a similar way as the others in the series.

What about the New Generations? I haven’t play it yet, but one review said that there’s bad and mid-way ending, as well as much more complex relationships than the main series.