Not like the others.

You feel your daughter’s big wonderful breast in your hand, it is like it was meant to be there, her skin is so soft, and her d-cup breasts seem impossibly firm and perky for their size.

Your tongues are intertwined in each other’s mouths, and your hands are exploring in ways you did not intend. You were just fucking talking about how you were your dad, and how sex was not going to happen.

But what you are experiencing now is not clinical, not clinical at all. Your daughter is a foot shorter than you and is grinding her naked pussy right up against your hard cock, and it feels really good.

She is sitting on you cowgirl style, on her knees with you sitting against your headboard. Your cock is very close to her pussy, this is going too far.

You pull away from the kiss and you lean down to say something to her, to stop this madness before it goes too far, and when you lean in one of her tits is in your face.

Kira lifts herself up and you start sucking on that beautiful breast. You suck her breast as you have never sucked a breast before. It is something very different, you could do it all day.

She keeps working her pussy up and down on your cock, which oh my god that feels good, and now you have those big tits in your hands.

You squeeze them, lick them and suck them, and they feel really nice. Somehow this feels natural, somehow this feels right. It shouldn’t, but it does.

Kira is grinding on your cock hard, and has a hand on it as well, stroking your and keeping you up against her, and then you feel something else down there.

Something wet, something tight, something really warm. Kira lets out a deep sigh, and lowers herself, pulling her breasts from your mouth, and pushing your cock inside of her body.

Just an inch at first, but your cock was wet with precum, and it is an understatement to say that your daughter’s juices are flowing, you have never felt someone this wet down there. Soon she gets a second inch inside of her, and then a third.

Soon Kira is leaning against you, holding you as your strong hands grip her big muscular ass, pulling her up and down the length of your cock.

Somehow she has taken all nine inches of you on the first attempt, she must have been really turned on, this disease is making her crazy. It seems to be making both of you crazy.

You have never felt anything like it, or if you have you can’t remember it. Kira is fucking you from the soul, she is welcoming you into her body with everything she has.

She is tight, and you have never felt anything this warm on your cock, you are sure of that.

You know you have to stop. This isn’t considered an effective way to deliver a dose, and it carries dangers. Kira is not on the pill and you are not wearing a condom, this cannot happen, it has to stop.

You roll her over onto her back to get out of her, to regain your senses and deliver the dose as intended, and you worry that she will wrap you up in her well-toned legs and arms, but she doesn’t.

You stare down at your daughter, your cock still deep inside of her, and she lays back and spreads her legs wide, and she doesn’t hold you, she just puts her hands on the sides of your face, looking you in the eyes.

“I love you dad,” is all she says. She looks so beautiful, so innocent, so deserving of something better than this disease and what you can give her.

You stare at her unbelievably sexy young body, youthful, firm and perky. Her wide beautiful hips, he magnificent d-cup tits, still firm, not sagging. You take in the sight of her beautiful toned legs, which you run a hand down, caressing her beautiful and muscular calf muscles.

And you see your cock buried in her pretty little pussy, you see she is shaven down there, when did she do that? Why did she do that?

No matter, you have to stop, she isn’t holding you, all you have to do is back up a few inches, and you can cum in her mouth as she needs, and end this madness.

You feel it rising within you, you feel a surge of pleasure building, you know what you have to do, and you know you have to do it now.

Instead, you feel yourself pushing back into your daughter, going even deeper. “I love you too Kira,” you manage, that was not what you planned to say. “I am close baby, I need to pull out.”

“No daddy,” she replies. Her eyes locked with yours, her mouth showing a smile, you see tears in her eyes. “Inside of me, I want to feel it inside of me, I need it, daddy. This is how I need it right now.”

It wasn’t the most effective delivery method, but not one that was heavily researched. Your team knew they could screen donors for healthy sperm, the proper protein levels, and sexually transmitted diseases, but you couldn’t do anything about pregnancy. So the idea of donors fucking women and maybe causing pregnancy was dismissed very early, like five minutes into day one.

Hopefully, a dose delivered in this way would be enough, it has to be.

Kira digs her hands into you and starts talking you through it, “Yes daddy, of fuck yes, I need it!”

You lean in and start to thrust into your daughter, gently at first, and then you build a quicker pace and start pounding her.

You admire your daughter’s amazing beauty as you fuck her. You watch her large breasts shake, it is amazing to see.

She starts to shake and squeal before you cum, son of a bitch she came first. You feel your daughter experiencing another powerful orgasm, and slow your pace to let it subside, trying to hold your own orgasm, and it works, until she had another, moments after the first.

You can hold your own orgasm no longer and you release inside of your daughter, as she is having her own orgasm, and damn does she put on a show.

You almost stop as you begin to cum, and it is an orgasm like you haven’t had for a while. You push your cock deep inside of your daughter and hold her hips tight as you release your sperm deep inside of her.

Kira’s head rocks back, her legs wrap around you to pull you in deeper, and she lets out a primal yell. There is a passion in her voice, an emotion you simply haven’t heard, she isn’t didn’t use any words, but you know what she was saying.

You look down and see her crying, with her eyes closed, but with the look, she has had after orgasm, contentment, satisfaction, and now something new.

“Oh thank you, dad, thank you so fucking much...” she finally says, still holding you inside of her.

Well, you are going to have to get her a plan B pill, you will need to do some research and make sure there are no known problems with Sperma Proclivitas, the medical name for what your daughter has. If it is known to interact with plan B.

A lot of things race through your mind. You can’t have the lab test her, they will want to establish a baseline with her donor, to test interaction. Maybe you can do that discreetly. You needed data now on how a patient responds to vaginal delivery, the most important thing was Kira’s health.

And damnit, you were just telling her how this was exactly what you were not going to do. What happened? How did you end up fucking your own daughter?

You finally pull yourself out of your daughter, and as your cock escapes her body, she opens her mouth and lets out a long moan. Jesus, she was beautiful, how was she always so beautiful?

You get up and take a shower. You shave and head to the kitchen to make some coffee and breakfast. You walk back in with some toast and orange juice for Kira, and you see she is still in that post-orgasmic trance.

She is still laying on her back with her legs spread as you walk in, uncovered, fully naked and unashamed. You marvel in her youthful beauty. Then you see there is a little cum is leaking out of her, and you see her collect it as it drips out, then sucking it off of her finger.

It seems every time she touches it to her mouth she feels another shudder of passion as if this is one long orgasmic experience. You have to leave soon, you know she won’t be making it to school today. You will call in and let them know.

You give her a kiss on the lips, a quick peck. “I am off to work Kira, I will be back to check on you at lunch,” you say, hoping she is coherent enough to hear you. “Call if you need anything.”

With that, you head out the door and drive to the lab, with some serious work to do. You need to get some workable data on what is going on with Kira, and you need to start getting something on the other side of the equation, something on the other side of the equals sign.