No, no, of course not... that's the way to go.
Hi Ms. Realgirl,
realgirl said:
Over the past few months there has been a role reversal; [my bf] Chris is pretty much the girl in our relationship and I sleep with whomever I want. Things have been good.
Congratulations! It sounds like you've accomplished pretty much what you set out to accomplish, and more. "So far, so good" you might say...
realgirl said:
Would it be inappropriate for me to ask him to marry me?
No, no, not at all. Of course not. As your submissive boyfriend, Chris should expect you — indeed, he probably hopes for you — to take the initiative and tell him, seductively and in a low throaty voice... with candles and wine in the evening... "it's time for you to marry me, sweetheart" (as you caress him, kiss him on the neck and nibble his ear).
Before he's able to collect his wits and respond, I suggest going on to say something like: "But you will need to understand, sweetiebuns, I have some expectations. First, I expect you to take MY last name such that formally we will be 'Ms. and Mr. (Realgirl's first name) (Realgirl's last name).'
See: Is it time for the man to take the woman’s surname in marriage?
Comments: Is it itme for the man to take the woman's surname in marriage?
Second, I expect you to agree that in our household there will be only one rule. It will be that I will make the rules and you will obey my rules. Third, please understand that in our household, I will wear the pants, you will wear the panties, and you will take your pants down. Fourth, in our household I will do the fucking and you will be fucked. Fifth, in our household YOU will be primarily responsible for doing the housework. I will take responsibility for motivating you with corporal discipline as I see fit."
Then, conclude by softly saying something along the lines: "Are you up for it, sweetie-darling...?" as you fondle Chris's cock with one hand, caress his hair with the other, and — before he answers — kiss him on the lips, with deep tongue penetration.
Re. "you doing the fucking and Chris being fucked," see:
http://www.take-it-like-a-man.com/index.html
Good luck! You are giving Chris what he wants and needs... I predict he will accept.
—Custer