It's one of my favorite fetishes.
That's what's great about it.
Even better if it's consensual, like you're the kind of guy even an angel would forego her celibacy for..
Why are demon/devil girls so tempting? Is it the subconcious thrill of Sinning?
I feel it's the same feeling that attracts me to monstergirls.
Well, it would be the best sex in your entire life.
Also, if you marry one cheating wouldn't be a problem since both of you have a contract, demons honors their contract and you pretty much lose your soul if you break one.
Most of them are drawn sexy as hell, literally. I think it's also because anyone who grows up in a majority-Christian country gets "SEX IS BAD MKAY" hammered into them for their entire childhood. There's also the appeal of "redeeming a creature of pure evil and sexiness WITH MY DICK."
I wouldn't cheat though, with a love so pure.
>tfw you will never marry a qt demoness and live a peaceful happy life together in a nice neighborhood