I’m sorry this is NTR with extra steps with the MC just watching. They use the horny lesbian shit way too often these days. I guess it’s the safe option in 2024, as a guy doing the exact same actions with no change would earn this manga the “Sexual Violence” tag in a second.
And to clarify, I’m not trying to say it’s okay when a woman does it like this manga, quite the opposite. I’m just pointing out the double standard