I would say if you're not married yet and she's already cuckolding you with your blessings you are in for a great relationship if you get married to this girl. Women are shy about those things at first but if she's willing to do it and tell you about it, she will probably realize that the details really turn you on. I went from hearing about it, to getting the exact details, to finally being allowed into their lovemaking room and even sometimes (depends on her bull) I get to do other kinky things that absolutely blow my mind (and hers!) such as sucking on her toes while he fucks her hard or laying next to her and kissing and whispering into her ear just how hot she looks and how happy she makes me by doing this. I'd say you're already in for a great start!!
