Personally I like more the NTRs where betrayal or infidelity is not discovered, but the grace of this type of games is that at some point it has to be discovered.i think Leto is even worse and dense than Ryu,Ryu at least has a bit awareness but sadly i think he will still lose his girlfriend in the end....that is why the girls try to lie and setup yui and marin even use drug to have sex with the antagonist...the corruption of yui is starting from this update onwards...and she will slowly addicted to the men cock once she lose her virginity
But I do like it when there are clues, signs or a hint of betrayal or infidelity.
For example,
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I really like the ending of this one because the man doesn't discover his wife's infidelity, but she does give hints or signs that something is up when she tells him that she would like to have another baby in between moans and she says she's not doing anything, just work.