What strikes me most about your story, off the top of my head, is how much the four of you treat sex as a commodity to give or get, or a bargaining chip -- instead of an intimate expression of your desire and feelings for each other.
Is there any love, caring, tenderness, affection, or friendship among any of you? I get no sense of that at all in what you wrote. Do any of you love each other, or is this just a group of people rooming together and focused on getting sex from the others whenever you can? It seems so sad to me.
Independent solo polyamorist seeking lover-friends willing to invest in friendship, companionship, and love, but without a need for partnership.
Never confuse commitment with exclusivity, love with ownership, nor sex with intimacy!
For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring.
~ Carl Sagan