"Nothing"

I reply, looking away, feeling myself blush.

"Oh, okay." Millie says in a chirpy way, then plumps back down on her sun lounger. She sits there for a while, looking like she's thinking about something, then looks over at me and says:

"Matt, I don't want to get tan lines, do you mind if I go topless?"

I feel my cock getting hard in my pants and my breathing getting heavy, and almost stammering I reply:

"No, not at all."

Hoping that I sound cool and nonchalante rather than an over-excited teenager really wanting to see his step-mom's big tits.

Millie reaches behind her and untied her bikini top, but to my disappointment she immediately lays down on her belly so I don't get a glimpse of her naked big tits.

I look over at my step-mom, getting a good view of side-boob, and I can look all I want as Millie's face is turned away from me. I pull my T-shirt over my head, then realise that is a mistake since I can no longer cover my hard-on. I think about what to do for a while, then I decide to jump in the pool to cool down and hopefully being in the cold water will get my hard-on down.

I walk up to the pool, then climb down the ladder into the water, then stand for a while, allowing my body to adjust to the water temperature for a while before plunging in.

I swim around for a while, the cold water getting my cock to shrink as I had planned, so I climb out of the water and look over at Millie. She's still laying on her belly. I tip-toe over to her, then let some cold water drops drip from my hands onto her back.

Millie starts laughing in surprise, and shouts out a delighted:

"Hey!"

Then turns around to push my hand away, and now I get a full frontal view of her big tits. They're massive, very firm looking, with pointy light brown nipples in the middle of light brown coloured aereolas.

My jaw literally drops and I just stare at them, while Millie laughingly pushes my hand away shouting:

"Quit dripping water on me." As she laughs and pushes my hands away.

Millie is still giggling, but slowly she stops, and as my eyes move from her big tits to looking her in the eyes I realise she has caught me staring at her tits. She makes no effort to conceal them though, she is just laying there propped up on her elbow looking at me, her big tits right in front of me, then she says:

"Yes?"