this is what open relationship feels like lol, everytime starting is always weird, by time everyone gets acquainted
remember lads, open relationship is not a good thing
the person above concluded that art sensei is most free, that is not true
in this situation, only the girlfriend and boyfriend are free
the mom will only be tied to the boyfriend
and the sensei has crush on the girl, so he is tied to the girl
so the girlfriend and boyfriend are most free as they can sleep with any of them and get away