I said it was Top!Grace propaganda time so it’s Top!Grace propaganda time:
I imagine Grace being more experienced, even if not practically he likely has more idea of what good sex looks like. Simon probably has very little idea. He was a kid when he became a solider and barely a teenager when he was captured by the COl. He never had time to think about a physical relationship (or any kind of relationship really) much less explore himself and what he might enjoy.
And Grace isn't stupid, he can damn well acknowledge that the power dynamic between them is a bit imbalanced. He's older, he's more experienced, and no matter how much he insists otherwise, Simon does hold some belief that he could be kicked off of Erid at any moment.
So Grace is constantly asking for reassurance:
"Is this ok?", "Do you like that?" "What do need from me, just tell me", "Ask me anything please, I'll do it”.
And Simon absolutely does not know what to do with that. He's not used to having this kind of control. It would be a lot of, "I-I don't know", "I'm not sure" and just non verbal responses.
And Grace would simply not accept that. "| need a yes or a no, baby. Please.", "Take your time.", "I'm listening I promise."
So Simon would open up more. Be more vocal.
Tell Grace what he likes, what he wants, what he needs. "P-please please-Grace I need it."
And Grace would light up. He would give Simon everything he asks for and more. He would listen to all the little noises and whimpers Simon makes and act in response.
He would learn what he likes. Learn what he needs. He would make Simon lose his mind. Forget his name. Scream till his throat hurts. Cry.
And Grace would cry too. And kiss his forehead and his face and all over after they were done.
And whisper sweet nothings in his ear. And Simon would be so certain that he could never feel this good again.
And the next time, Grave would prove him wrong. He could feel even better.
A/N: I got a little carried away lol