when she says you want to do it.
Take fucking control right then and thereyou are the man and its your job. Start the for play. Kiss her,suck tits,rub your cock on her vag. Then shove her head down there.
You are luck bro. My wife don't even say you want to have sex.
she will "hint" that she wants it. Most women are like that. You just have to take charge from there.