The relationship between the three is obviously not more stable than the relationship between the two because of jealousy and limited communication. So I tried to look at the relationship of three people from the perspective of relationship stability.
The beginning of the relationship between the three in the film is unexpectedly harmonious. As for the reason why threesomes are so harmonious in this relationship...it's because there are two people who have never been independent, twin brothers and sisters. They can like a person together, but cannot accept a single person relationship. And Matthew was attracted by the two at the same time, which made the relationship stabilized.
The first scene where the sisters sleep together makes one think they have sex, which is confusing because it's hard to imagine that Leo would have been comfortable asking Matthew to have sex with Isabella if he had sex with Isabella. . However, it wasn't until after Matthew and Isabella had sex that Matthew (the audience) knew that Isabella had always been a virgin...that is, there was always purity between brother and sister. They were just two kids who were always in their own world, no one had ever dated Isabella, and Leo was the only man Isabella had really had contact with before Matthew. After Matthew dated Isabella alone, Leo had sex with a girl out of 'jealousy'. And Isabella cries and slaps Leo's door. That is, the relationship with her brother has always been Isabella's top priority. Although Leo's feelings in the film do not have an obvious priority of performance, the jealous act of having sex with other girls also shows that Leo deeply loves his sister and does not want to be separated by Matthew. Later, when discussing Mao, Xiaohongshu, and the movie, Leo locked Matthew's head and established the relationship between Leo and Matthew. That is to say, in this relationship, Matthew only loved his sister at the beginning until he loved both brothers and sisters at the same time, and the brothers and sisters also experienced the process of entanglement. At this time, the relationship between the three of them stabilized, and they also lived in the tent together.
In reality, multilateral relations are difficult to exist (excluding cheating, transactions, etc.). The film should show the possibility of multilateral relations. Of course, the film is good because there are all kinds of good-looking erotic scenes. For example, the three mirrors in the bathtub are very classic.
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