Well, there is that type of swinging in the game, but I called it "NTR/Sharing" because at a certain point it goes more to NTR's side... Since the MC asks her to do it with others, but later after a while she starts hiding things from him... It's not like she completely stops loving him and goes with the BBC. After that happens, she tells the MC and the MC can choose whether or not to forgive her for hiding things from him (like at some point she met up to have sex with the other guy without the boyfriend knowing) or not... And well, until now there is only the option of forgiving her, and by doing so that is where the totally "swinging" part of the game begins where she no longer hides anything from him and so on. It sounds convoluted, but from the beginning I wanted to make a mix of NTR with Netorase