Idk if anyone ever asked this. But, is this count as grooming? Technically, FMC wasnt leading him per se, i guess?
based on every definition and breakdown I've ever come across,
No. This doesn't count as grooming.
"grooming" would be if Sena had pursued Nao first, spending time with him with the
express purpose of getting him attached to her and manipulating his feelings up until the point she could "legally/ethically" start a relationship with him.
It's deceptive and coercive and a long-term process that requires intent on the part of the older individual.
That in no way describes Sena as a person, or the state of their relationship, as we have been shown over the course of the series to this point.