Kouhei and Mako are a couple deeply in love, but Kouhei worries about Mako’s reluctance to have sex with him. One day, Mako makes an unexpected proposal…
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IIRC in this story GF wants to have her cake and eat it. She doesn't gets off when doing it with her BF despite him being good so cucks him right away but gaslighting him first into swinging. The thing is , swinging goes both ways and she doesn't like it when she realizes more girls are into her BF and gets mad about it.