I want a guy to spit in my mouth while he's choking and fucking me... it's been a really long time since I've wanted this
Very hot...I'd love to do that for you 
I have done a lot of D/s play with submissives. I personally enjoy finding the switches that turn a sub on. I recall one sub I had played with for over a year. She had never been spit on before....while fucking I pulled out and swatted her tits some....then spit on her pussy and penetrated her again...she came. She then wanted to experience it more which I was happy to oblige.
The first time it ever happened to me, was with my ex-fianse David. We were already heavy at it and he was on top of me. He would slap me a few times while thrusting slowly, and then he would switch gears and fuck me hard while choking me. He wouldn't cut my airway completely but enough that I was struggling for every rasping breath. He let me go, and started to go down on me. He wasn't just licking, he was sucking really hard on my labia and clit, and then he came back up, grabbed me by the throat and when I opened my mouth he spit in it. He start asking if I "liked that mouthful of [my] pussy juice?" I told him I loved it and that got me a "good girl" and then he'd do it again. He tell me to beg for it and then he'd choke me so I could hardly talk. He'd slap me say he couldn't hear me and then tell me to speak up, and then he'd choke me again. He'd finally let me beg for it and he would go down on me and then come up and spit again.
If he wasn't ever happy with my begging he'd stand up and step on my face and make me beg for it into the bottom of his foot. I hate feet, utterly despise feet. never liked them and didnt want his on my face, so I would be practically screaming for him to spit on me...
Anyways, I don't get that urge too often and when I do it usually lasts until I either have sex or masturbate, and then it usually goes away.