unsure if i'm bull or cuck, advise or experience needed

i'm a white dude, 33, straight, 7inch & big girth. 17 stone but carry it well. 36 inch waist. i've read a lot of the messages on here & am intrigued about this cuckold business. i have a gf & we have a fantastic sex life. we talk about swinging and playing with other people in the bedroom a lot. she has had bi experience before & would love to have another. i'm straight but did have an experience a long time ago, i sucked off a guy at a party & decided it wasn't for me but in our bed talk, i fantasize about sucking cock just to turn her on. i also fantasize about fucking a woman while her partner is present & restrained. if she wanted i would let him suck my cock & balls then fuck her and fill her. i would love to try this out and see how it goes. i would also love to have another guy with me & my gf and watch him fuck her stupid but am not to keen on the humiliation thing, i would just love to fuck her cunt filled with cum and eat some of it first. i'm in the u.k. & would love some experience of fucking a wife while her partner watched & i could humiliate him.