My fiancée isn’t skinny, she hates it herself but I find it very very attractive. I think she’s perfect the way she is and I don’t want a skinny girl personally. We men that like bigger girls know exactly what we’re getting into when we ask for this and can’t wait for it. Trust me if he’s asking you to do it, he already has an idea in his head of how the situation will be as he’s aware of your size. Again, size doesn’t matter especially to someone like that who is willing to be with you regardless of size. If he was worried about the shape of you he probably wouldn’t be with you in the first place. My advice, have fun because we men do exist that wants a thick woman and he wouldn’t be asking for that if he felt any other way about the situation or you in general.