Dream of female, apartment, having sex

It's the middle of a zombie apocalypse and me and my best friend (we are both female and 16 years old) are running from the zombies after putting human remains on the floor to distract the zombies. We then enter into a small dark apartment where zombies would find it difficult to reach us. I ask my best friend if she loves me, she said "of course I do" and the next time she looks at me she is wearing a wedding dress, dirty and old, moth eaten. I look away and ask if she is a virgin, she says she is. I tell her I am (this is true as both of us are virgins). She asks me if I want to change that and I say I do. I tell her I'm nervous about having sex and I turn around and she is lying on he bed in seductive underwear. She then gets me to lie down and climbs over me, she then says, and I remember this specifically, "this is why the wife is needed". She begins to undress me and using sex toys on me, and we eventually have sex.