"Oh, she's out shopping, I haven't seen her all day."

That was a lie. Actually, she was balancing in front of me, using her fingers to peel her knickers to one side, showing me her plump, pink labia. Her swollen clit. She was starting to stroke herself, running a finger up and down those wet, delicious lips. I had to swallow, hard.

"And has she been a good host?"

I wondered if there was a hint of jealousy in Ana's voice. She can't have guessed what was going on, surely?!

"She's been great actually, she doesn't get in my way, lets me get on with my studies. And she's a great cook," I said, in my most neutral tone.

I tried not to stare as Stella reached down with her other hand and sank two fingers deep into her tight pink twat. Right in front of me. I could smell her arousal, her soft, feminine scent. I wanted to reach out and lick her, but I couldn't. She was moving her fingers in and out of her silky pink folds, right in front of my face. Looking up, I could see those big, swollen breasts, encased in black satin, hanging heavily like desirable fruits.

"It must be strange though, to be living with someone you haven't seen for so many years. And it's not like you ever really knew her that well, did you?"

"Well, she's been a part of my life for ages, Ana. You know that. Even though I didn't see her for years, she was still a family friend. Speaking of which, how's your family?"

Stella was now running one wet finger over my cheek, dabbing her juices against my mouth, before re-inserting it into her tight cunt. Playfully, she winked at me, then stepped down from the sofa, back on to the carpeted floor.

Ana was telling me about her younger brothers, how annoying they were, and how her Dad wouldn't let her use the family car to go to the water-ski park. I tried to pay attention, agreeing at the right places, trying to sound sympathetic.

But it was hard to concentrate. Because Stella was now crouching on the floor in front of me, facing the door, her ample bottom raised up, the thin black line of her knickers running between her big white cheeks. She wasn't on her hands and knees, but rather in a strange crouching position. She was still wearing a bra. I watched her pull the little black underwear down over her thighs. Her hands were holding her buttocks apart, showing me everything. The tiny pink, puckered hole of her arse. The fat lips of her pussy beneath, slick with her juices. She held the pose for a minute or two, letting me stare at her body.

"And how's the sauna? Has your Dad built it yet?" I was trying very hard to show an interest in Ana. Really I was.