I understand you don't want NTR of any kind, but sense Issei seems to be able to grow much faster in power and in this update showed you are willing to alter cannon if Issei stats are high enough, seeing him push Koneko out of the blast from the Boom queen and her on the roof of the Old School building, I think some of Sona Sitri's peerage should be ale to become Li's by them seeing Issei showing off super powers quickly Momo, Kusaka, and Tsubki I think make the most sense. I am willing explain why if you want.
Tsubaki is impossible as that would be NTR, at best I could make a separate game in future similarly to what I did with Grayfia to avoid NTR.
Momo and Kusaka are more possible since they gave up and are fully available, the issue is that they're "dirty" characters since they had a previous love interest who wasn't the protagonist (despite both being otherwise untouched), I usually use dirty characters to get rid of male characters without creating angst to free up good potential heroines (Such Ruruko with Saji to free up Sona). I don't currently have such plans with Momo and Kusaka right now, so unless this changes in future, I might do something with them.
However, the main focus is on the large quantity of good heroines, currently we're at the beginning of volume 5, and Rias/Asia already have 6 scenes each. I plan to keep adding scenes to them, but also have all future heroines have a roughly similar number of scenes, so realistically I might have my hands too full with the main cast of heroines, but we'll see.
When it comes to the near future, Akeno (3rd) and Xenovia (4th) will be next.
Why are there so many text? I came here for porn, not to read novels. At least it could have been balanced.
This game is a visual novel; However, it's not a pure one.
This game also features gameplay (RPG), the possibility to skip all the text, all the gameplay, and once unlocked (Seen them at least once) you can just replay the hentai from the gallery.
If you don't like text-heavy scenes, you can instead play another set of hentai content (Ecchi 3D) from the hub once you have confessed to the heroines (Currently, only Asia and Rias). Those scenes have near zero text and are animated.
With a little of patience, the game is designed to be flexible enough to be enjoyed by multiple types of people, but if you hate Visual Novels to the point that even this is too much grind, then I cannot help you as that'd be far out of the scope of this game.