yeah. shes married and has a kid. also, saitou told kaoru that shes happy with her life now. i doubt this will go love triangle. rather, saitou can tell whats going on with isechi cuz saitou went through the same thing and she sees now that teacher-student relationships are iffy. she probs also wants to spare isechi the pain of rejection since saitou was rejected by kaoru on the grounds of teacher-student relationship and thinks she'll do the same to isechi.
remember, she doesnt know about the agreement isechi and kaoru have.
Kinda bugs me that here, Kaorin seems to be as tall as Sakaki (at least their torso looks the same lenght).. aside that, the couple is nice and the pic is cute. Would be nice to see more of them <3