I haven't done it yet. But it's something that I am so interested in. a finger in my ass feels amazing during sex, a butt plug would surely feel even better. Even just the thought of how full I would feel makes me all tingly.
I love that feeling, I don't need it everytime though. I rather it be a surprise.
Yes, I've always wanted to be part of a threesome. I would have absolutely no problem adding another person. I can't think of any limitations I would put on it. Everyone would have to comfortable and no jealously though.
I always masturbate as I read the stories. My favorites are when the man are woman just takes the girl.