"I find mature women sexy"

I hear myself saying, having no idea why I said that, hoping Millie does not take offence that I just called her "mature".

"Oh, really?" Millie says without opening her eyes.

"Yes, they just seem so confident in themselves." I reply, then continue:

"I guess girls my own age just don't really do it for me."

Millie opens her eyes, uses her hand to shield the from the sun, looks at me for about a second and then says:

"Go on, tell me more."

I look back at my step-mom and say:

"I mean, girls my age, they are so insecure, don't know what they want, play childish games, lack sexual experience..."

Millie raises herself up on her elbow when she hears that last part and asks:

"And what about you Matt, are you sexually experienced?"

I blush on hearing this, most likely visibly so, and try to play it off by saying:

"Well, you know, I don't like to 'kiss-and-tell' and all that..."

Millie leans over and rubs my arm while looking me in the eyes, saying:

"Go on, tell me Matt."

I blush even more and shyly shake my head, then Millie sits up on her sun lounger and says:

"We'll make it a truth or dare session."

She smiles excitedly, then says:

"You go first with a 'truth' and I go for 'what is the furthest you have gone with a girl?'"

I don't really want to answer, but I don't want to back down from a potentially very interesting situation. I briefly contemplate lying, but I decide to stick to the truth and reply:

"A handjob."

Millie looks a bit surprised and says:

"So you are still a virgin then?"

"Do you have to rub it in?" I reply a bit surly.

Millie let's the topic go, leans backwards a bit so her big tits are pointing upwards, then says:

"Ok, your turn. I choose 'truth'."

Then she looks at me in a mischevious way.