"Truth"

I reply after a bit of hesitation. Millie looks at me for a little bit, like she is thinking about what to ask, then after a few seconds says:

"Do you have fantasies about me Matt?"

Then she looks me straight in the eyes and waits for my answer. I look back at Millie, doing my best to look her in the eyes but my eyes soon slip to looking at my step-mom's big tits, then I swallow hard and say:

"Yes, sometimes."

Millie smiles at me and reaches out and rubs my arm and says:

"That is okay Matt, it is normal for a boy your age to fantasise about older women they know."

I blush a bit and keep looking at Millie's big tits and don't say anything. Millie keeps rubbing my arm and says:

"Tell me one of your fantasies about me Matt."

I shake my head, and say:

"That feels a bit weird Millie."

Millie rubs my arm some more and says:

"Please Matt, it would make me very happy if you did."

I think for a few seconds, then say:

"Well, in one fantasy, I am in my room watching porn, and you come in catching me jerking off, but instead of getting upset, you help me finish."

Millie squeezes my arm and says:

"How do I help you finish, Matt?"

I blush a bit, then say:

"With your mouth."

"That's really hot Matt, your step-mom kneeling in front of you sucking your cock." Millie says, squeezing my arm for emphasis when she says sucking your cock, then she adds:

"And do you make me be a good little slut and swallow your cum?"

I blush even more and nod.

"That is a really nice fantasy Matt." Millie says and releases my arm, then says:

"Ok, I go for dare for my turn."