https://www.dlsite.com/maniax/work/=/product_id/RJ01416693.html
https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_618105/

这应该算bss

Base +6, EAINA -6, skylife1 +6

Straight bss

Base +8, skylife1 +6

has there been a story where mc got bssed then sent a video like this but mc then uses it to blackmail the girl to potentially ntr her?

Base +7

有pjja的味道

Base +7, twinrite +6

[Synopsis]

Yamamoto Shinya pursues his high school crush who is a senior on the swimming team and enrolls at the same university.
He reunites with the senior Yoshida Kazumi at university after a long time, only to find her chatting amiably with a man he doesn't know.
After club activities are over and everyone is supposed to have gone home, he hears a noise coming from the shower room.
He peeks in and finds the man Yoshida was talking was having sex with someone.
He has a bad feeling and when he sees the woman's face, it's the woman he loved, Yoshida...
He loved her before this guy, so why...?
Enjoy the despair of watching the senior he loved having sex right in front of his eyes.

Base +28, nuts987 +14