I dream of cuckold

I can't stop thinking about it. My girlfriend slowing sitting down on a big black cock. I am only the third guy she has ever been with so she is very tight. I imagine her meek demeanor would change to ravenous vixen. I dream of her porcelain skin legs straddling the massive cock and grinding away or in the air around him as he pumps her full of cock. I always climax to the thought of him fucking her doggystyle while she attempts to suck my cock between big moans. I currently have her into sucking my cock while I finger her with two fingers. THe Head is always better, we have looked at cuckold porn together before but she played it cool as if we were making fun of watching random porn. next time i will rub her clit to see if she enjoys it. Perhaps one day I will live out my fantasy.