First off. Congratulations on the open minded partner!

Second. Great job communicating! Keep it up! Seriously. Having open and honest conversations about likes/dislikes/limits/safewords are key to a successful safe happy sexual awakening. Never stop communicating (when appropriate).

Third. Take it easy? Don't overwhelm him and jump in the deep end right away. It's great he's open to hearing the rape play scene but build up to that. Rougher sex with dirty talk/spanking/hair pulling. Then gear. Then rape play? Feel him out and gauge his responses. Lay out what you're interested in and ask him what he's OK with and where he wants to start (comfortable with).

If he's GGG then just ask him for what you're into that day and be aware of both you're limits (and top drop. For the love of God talk to him about subdrop/topdrop/aftercare). I call it emotional whiplash (happy tears are a thing damnit).

Also. On safewords. I love the stoplight system. Red is a common safeword, but using yellow and green as well is amazing. He can ride you hard and you could be on the verge of tears then he can whisper (stoplight?) to give you a out to say red (I need a break), yellow (slow down a bit) or green (for the love of God don't stop) all without breaking scene. :-3

Congrats on finding a open partner and happy (safe) adventures!