For the past five months or so, I've had fantasises about fucking my nineteen year old step daughter Rhianna. She's a very good looking young woman and always dresses provocatively, but with style. I'd never been inapropriate prior to five months ago, hiding my sexual lust for her and always trying to be a good step father. Then one morning I found a pair of her panties outside our bedroom door. My wife was at work and Rhianna had left for college. Picking them up I could see they'd been worn and put them close to my nose. Her sex was easy to smell and it had the desired effect on my cock. Taking them into our bedroom (Her mothers and mine) I lowered my sweat pants and masturbated, using her panties to stimulate my cock and a fantasy of fucking Rhianna.

Over the next few months I'd ocasionally find a pair of her used panties just lying around. They'd always been worn and her pussy smell was always strong on them. Each time I'd use them to masturbate and each time I'd cum all over the gusset part, before putting them in the wash. I'd also noticed during the five months, Rhianna had begun to wear revealing clothing when she was around me at home. Low cut tops without wearing a bra, or as like a month ago when her mom was staying at her aunts overnight. Rhianna wore a loose fitting pair of grey shorts. As she sat across from me that night, I could see right up her loose shorts each time she lifted her legs. And every time I got a very good view of her closely trimmed pussy as she wasn't wearing any panties. I went to bed that night with a painful hard on and masturbated once more thinking of fucking my step daughter.

Now to two weeks ago. Rhianna had asked me to fix her wardrobe door. It wasn't as though it really needed fixing, but she'd asked all the same. She'd gone to her frinds house, minutes before I was going to start in her room, telling me she'd put her private stuff away (I always checked as I didn't want to pry or appear creepy to her). So finding her diary open on the bed was a surprise. As was the contents when I looked at the open pages. It had been left at the date of her mom staying at her aunts and it reads: (I've got it with me now)
"I know he's been using the panties I leave around for him, as they're always in the wash basket. He masturbates into them, which is sooo fucking horny. I retrieve them and do as he probably does, I smell his cum and play with my breasts and clit, making myself cum every time. Mom was away tonight so I've been teasing him all night, flashing him my breasts as I bent over, or my pussy each time I lifted my legs sat across from him. He tried not to look, but I caught him lots of times which made my pussy very wet. As I write this I can hear him wanking. Their bed squeeks when he masturbates and it's squeeking right now. My turn to pleasure myself I think. Oh well diary, see you again tomorrow and hopefully he'll have got the message by then".

This last fortnight has been a sexual nightmare. On the one hand I'm "trying" to be faithful to my wife and our wedding vows, on another I now know her daughter is teasing me sexually. And finally I know Rhianna probably wants me to fuck her. And boy do I want to bury my cock up her wet pussy and super tight ass. My problem is how the fuck do I do that, without fucking up my marriage.