You agree to be the donor for your daughter.

“Ok honey, I will handle it for you, as long as what I can produce is enough for what you need,” you say, drawing a big smile and a smothering hug. She is surprising strong.

“Thank you daddy!” She almost yells at you, “I knew I could count on you, no matter what. I knew it!”

You hold the embrace for a few minutes, before she leans away from you, with an odd smile on her face, “So you will do it again before bed right?” She asks you, “And this time no fooling around with a cup dad, I am starting to feel it here, I need the best you have to give.”

You see the change in her posture and in her face, she is starting to act off again, the disease was making her horny again, hungry for cum.

You can see that the delay in delivery killed the potency of your earlier dose, it hasn’t been very long. So her stage seems to be advanced, and you can’t risk a delayed version dose again.

You legitimately feel bad for your daughter. She didn’t pick this, it wasn’t something she was doing of her free will.

And you consider again that you just delivered, like thirty minutes ago max. This is too fast, she isn’t stage one. At least not very likely. This is at least stage two.

Kira moves closer to you on the sofa and puts her hand on your leg, up high and on the inner leg, “Do you think you could do it again now, and then again at bedtime? I need it daddy.”

“Kira, baby, the male anatomy doesn’t work that way, I need time,” you reply, kind of thankful she didn’t have any idea how this worked, it had only been thirty minutes since you last came. “I should be ready later, but I don’t know that I could get it going again so fast.”

“I don’t need it later,” Kira said seductively, moving her hand to your lap, touching your cock. “I need it now,” she leaned in close, you feel her breasts touching your chest. You can smell her arousal, see it in her rushed breath.

“Daddy I need for you to put it in my mouth, I need your cum, and I need it right now.”

Well fuck, you have seen this. When some people afflicted with the disease get their first dosage of sperm after they become symptomatic, they sometimes start to become a little crazy about it. Something like sex addiction.

And even for that behavior, this is way too fast. She shouldn’t need it so fast.

Like a person addicted to a powerful ****, her mind and body now wanted to feel it again, to feel the relief, a very sexual release when she felt cum in her body again.

It wasn’t her fault, this was the disease influencing her, this wasn’t how she normally acted. But if you don’t help her, she could progress, and they had found these aggressive cases to be more likely to progress quickly.

She could die if you don’t take care of her, or you would have to send her to other donors, and you didn’t want to visualize another man emptying his balls into your daughter’s open mouth.

And her principle wanted her, you know that sort of man. An educator who is around teenage girls all day long, and he managed to get into the donor program. You imagine that he is using this to pick and choose students to provide treatment for.

This sort of man probably spent his days sexually abusing and fucking underage girls before this disease, now he has an excuse.

Kira isn’t content to wait for you to finish this internal dialogue, while you debate this internally, your eyes widen as she lifts and removes her tight shirt and exposes her beautiful breasts for you.

“I can help daddy,” Kira says seductively, squeezing her breasts. You cannot remember a more seductive sight. “You like what you see right? You like seeing a girl’s tits don’t you dad?”

Your eyes focus on her beautiful breasts, a full d cup, you were sure if it, and a beautiful olive skin tone, just like her mom. But fuck, her mom didn’t have curves like Kira, she didn’t have these big breasts.

“I know mine aren’t anything great, but I don’t mind if you stare at them dad…”

You talk to yourself, look away, look away, look away, Fuck! Look away god damnit! But your eyes betray you. You don’t look away, you stare. Taking in every beautiful inch of your daughter’s topless form.

Kira pushes her big breasts together, and squeezes both of them in a way she could have only done on instinct, but that is commonly seen in porn and by strippers. Fuck it is hot.

Your daughter’s tits are not supposed to be hot to you. And she is not supposed to be topless and teasing you either.

You now feel your cock stir, and Kira smiles as she sees the bulge of your growing and hardening cock. She opens your fly and pulls your cock out to look at it, she looks at it as if it were a beautiful and tempting dessert, she has hunger in her eyes.

She wanted more than just semen from you, and you knew it wasn’t her fault. You had to do something quickly. But you could not deny that when she patted your cock earlier, and when she put her hand on it now, that her touch is different. You shouldn’t want this as well, but you do.

It is like nothing you have ever felt. Erotic, wonderful, taboo, and you could almost feel electricity in the touch of her hand as it wraps around your cock.

You wanted it to never end, and you knew deep down that she should not touch it, your daughter should never have seen or touched your cock.

You stand up and she lets go of your cock, she is kneeling before you with her hands now on her knees, looking up and smiling at you. She looks so innocent. She doesn’t deserve any of this.

You start to jerk your cock for her, looking at your beautiful and topless daughter. She hasn’t stopped playing with her big breasts, it is amazing.

Kira moves in closer to you, still on her knees in front of you, your cock just millimeters from her mouth, from her beautiful young mouth.

“Thank you daddy,” your daughter says to you, running one hand up the inside of your shirt, feeling your well developed pectoral muscles. “Thank you for looking out for me, I love you so fucking much daddy.”

As she says this you feel it building inside of you, and you feel her other hand gently squeeze your balls, and it is too much for you. “Kira, here it comes...”

You stop your jerking, to give her some time to get ready, and she opens her mouth very wide. Kira is impatient and hungry, and puts her own hands on your cock and starts jerking it herself, and you start to cum almost as soon as her hands touch your cock.

Some of your cum lands in her mouth, some on her face, and some runs down to her tits and on the floor. But it keeps coming, and she moves her mouth right up to the tip of your cock, her lips first touching and then wrapping around the tip as you continue to orgasm.

Jesus Christ her mouth is on your cock, you have never seen a more erotic sight. You cum more than you can ever remember before, and your daughter is milking your cock into her mouth, you feel her lips, her mouth sucking on the tip of your cock. You hear her moan.

She slows and swallows, and then keeps jerking the cum out of your cock slowly.

When you finally finish your orgasm, Kira swallows again, and you remind her not to waste any of your cum. “You need every drop honey, you need to get it all.”

In any other circumstance this would be porno level dialogue, but here and now it was very normal, or at least it seemed normal.

You watch as your topless daughter grabs her phone and puts the camera on herself to find the cum she missed, cleaning with her fingers and her tongue. She then cleans her breasts, and then gets on the floor and licks up the cum she missed. She doesn’t waste a drop.

Fuck that was dirty, and erotic. It was the sexiest thing you have ever seen a woman do, she finishes herself and the floor and now goes for your now softening cock like a hungry predator.

Licking what she can find off of the outside, and then sucking on it hard for twenty or thirty seconds, trying to get every last drop of your precious cum. You have had blowjobs before, but fuck this feels great.

She lays back on the sofa, in what looks like an orgasmic state, which you have seen before. Studies showed that a small group of test patients would grow to orgasm at the taste and feel of cum, and you didn’t want this for your daughter. This wasn’t a good sign at all.

She is squeezing one big breast, and her other hand drifts down into her panties, she is touching herself, probably orgasming.

This meant that she was in a much higher risk group. She would need more care, and shorter delivery times when in need, or she would more quickly advance to later stages.

And she might advance quickly anyway, women in this stage usually advanced even with treatment. You had never been able to do more than slow it down. But you had to with your daughter. You had to give her all the treatment she needed and then some. Fuck you had to slow this down for her.

Forget two doses per day, your daughter might require five. She might need ten, she might be beyond treatment already. You watch as she gently moans and gyrates on the sofa. She now has both hands inside of her panties. Jesus she needs help.

And if she were to proceed to the later stage it might be impossible to give her enough of the protein found in semen to keep her alive. At a certain point a patient just could not drink enough semen to stay alive.

A very steady supply was needed for Kira, and also a quick cure, perhaps a synthesized version of the protein found in semen.

Kira was now squeezing her breast with one hand again, and her other hand was still in her panties, and she was shaking all over. She was being overpowered by a very strong orgasm.

It is amazing to see, and sexy as fuck, and completely wrong, as it is your daughter. But you resolve to do all you could to help to save her.