I actually would have to disagree.
I think their sex life would be thriving and kinky, so having an extra dick in the equation wouldnt be a surprise to me.
I do think though, Zayn would be more of a sex toy to them.
Making each other jealous throughout the act
to the point where they would pounce on each other
and forget Zayn is in the room…
let me stop before I explode.
And yes they do belong to each other (◡‿◡✿)
THANKS FOR MESSAGING ME (◕‿◕✿)