That's basically why. Nanakusa knows he's not actually cheating on her. And physical intimacy is something she doesn't care much about "outside of blood sucking apparently".This plot line is getting better, glad they are going to investigate the affair. Seems like a realistic option.
Still not enjoying the fact MC is "dating" that retard, and why are MC and FMC so okay with it? Feels weird cause MC and FMC have a thing going and are already basically dating.
I'm late as hell but I got the same feeling here.New girl gotta be the vampire killer detective