My gf is naturally very submissive and enjoys it when I dominate her, pin her down, choke her, call her a slut, and so on. Over the last couple months, we've been indulging more and more in the reverse dynamic. I bought her a large vibrator that makes her cum like crazy. I can occasionally make her cum from PIV but only if I can hold on for a long time, which is difficult because Im uncircumcised. Seeing how easily the vibrator makes her cum, I cautiously started introducing some dirty talk about how she likes it big, I'm too small for her, etc. She seemed a bit put off by this at first but has gotten more and more into it. Now she really enjoys jerking me off while she tells me how I'm too small for her. It turns me on quite a bit because she will stroke super fast and tell me to hurry up and cum because she doesn't want it inside her.

The other night I pushed the dirty talk a bit further and suggested maybe she needs another guy with a bigger dick so she can get dominated the way she likes but still cum as hard as she does on her vibrator. I was nervous she would be freaked out by it but she responded really well. She started saying all kinds of dirty stuff almost like she is already familiar with the cuckold fantasy. Telling me she's going to make me watch her fuck someone else, that she'd let him do all my favorite things like doggy style and choking her, that she would make me jealous by moaning extra loud, etc.

She's never been a very promiscuous person, and has only had sex in the context of a committed relationship, so I'm not sure if she'd ever actually want to act this fantasy out in real life. Tbh I'm not sure if I actually would either. It's my number one fantasy but the guilt I feel over it after I cum makes me scared of how depressed I might feel if we ever went through with it.

Anyways, for now I'm excited to explore the fantasy with her. The last couple days when we've had sex, we've both been cumming harder than ever from the dirty talk. Happy to get any suggestions for ways to slowly explore this fantasy as a couple.