Some of the boys over at /wg/ have been having fun with this, so I thought I'd shill it here.
Behold, a /vt/ original Visual Novel!
A high school romcom for the ages, Ninisanni Scenario has everything you're looking for. Funny as fuck dialogue, smooth and dynamic animations, sexual harassment, villainous schemes, underage drinking, sentimental romance and most importantly, CUTE GIRLS!!!
Oh, and sex scenes. Like, a lot of them.

It's a full length VN, (clocking about 5-7 hours if you go for all the achievements) with ten routes prominently featuring the girls from Lazulight, Obsydia, and Ethyria.
Not a diehard fan of NijisanjiEN? No problem! This VN was tailored for people who are totally unfamiliar with the branch. Even those who've never heard of vtubing can enjoy it to the fullest.
And if you love the Nijigirls, then this is some SSS-tier fansa, you're lucky I'm not charging you for it!

Starring:
>Elira Pendora as the ex-girlfriend
>Finana Ryugu as the little sister
>Reimu Endou as the disciplinary rep
>Rosemi Lovelock as the queen bee
>Nina Kosaka as the school nurse
>Selen Tatsuki as the bully
>Petra Gurin as the otaku
>Millie Parfait as the kouhai
>Enna Alouette as the stalker
>Pomu Rainpuff as the pomu

If you're on the fence, try it out! I guarantee these goofy girls will nestle their way into your heart!