Ok with conditions

Sam "you remember she pregnant."

Frank "yea, that doesn't bother me. I still like her."

Sam "ok, but you're going to need my help, and I have grown kinda fond of that pussy."

Frank glares at Sam and Sam just smiles back." Dude, I wanted to date her years."

Sam mocks him, "Dude, that all falls through if I don't help." He winks at him as he walks out the door. "Have fun with it" Sam quickly throws his pants on and walks straight out the door.

The sounds of the door closing wake the still tied up Kate "Who left"

Frank unites her feet "your brother."

Kate let out a shy of relief, "ok, it over then."

Frank "about that, I can't promise that even this will bring 'that' man back, and I was wondering if he doesn't make contact, you would go out with me"

Kate "I have a boyfriend, and you're well ... A HUGE CREEP!!"

Frank unties her right hand. "About that… Do you think your boyfriend will stay when he finds out about…"

Her hand instantly grabs her stomach. "Well… Yea, of course."

Frank "really you cheated on him …. Twice! Will either way if he doesn't, I'll be here waiting!"

Kate "Yea waiting to get your rocks off a few more times than run away."

Frank unties her left hand. "No… I was planning on helping. But if he stays, you don't need me to help, but if he doesn't, you have my number." by the time he finishes speaking, his pants were on, and he was out the door leaving Kate alone to think to herself.

There was a full nine days where neither of them talked to each other. Which was an eternity for Sam and Frank. However, Kate was the first person to start the next conversation when she reached out to Frank.

"Are you sure you're fine with me being pregnant with another man child?"

"Of course."

"Than I'll accept your offer."

Frank "You don't know how much I want to just tell you that I'm so happy, but there may be an additional condition for us to date."

Kate "I just told you that after years of cursing on me that you could finally date me, and now you want to add conditions."

Frank "For your shake, yes. Kate, what we did the other night is not normal."

Kate "Yes, I know, and if you want to date me, you will never bring it up again!"

Frank "Ok but Sam might try telling you what I did with him"

Kate "Yea, and I'll just tell him that I don't care."

Frank "That the problem he believes, mostly rightly so that you wouldn't normally date someone that would do something like that."

Kate "Oh, I see. So if I blow it off like it's nothing, he will get suspicious and start looking into it. He will eventually tell you what I did, and if I am ok with it, he will start thinking it was me so especially since we started dating so soon afterward. That changes everything."

Frank panicky texts her back, "It doesn't change the way I feel about you or the fact that I want to help with your kid."

Kate "look, we can't date now it's over!"

Fank "wait, I have something that might work. Just hear me out."

Kate "ok, but make it quick."

Frank type as fast as he could, coming up with the best lie that would both make Sam happy and hopefully make Kate be ok with her dating him. "If Sam thinks that telling you will risk his own chances to keep having sex, he wouldn't dare tell you."

Kate "I don't have to agree to that. I'm a catch!"

Frank "yes, you are a catch, a wonderfully amazing catch, but how many guys are going to see you as I do when you're standing behind a child!"

Kate goes quiet until 2:30 am "ok. Deal, but we play it day by day. If I'm not wooed of my feet every second, or we are not keeping my stupid brother quiet, it's over."

Frank instantly text back "DEAL!" Before instantly texting Sam "WE ARE DATING!"

Sam is awake by the phone ringing; he slowly reads it before texting back, "congrats, dude, so when am I getting my dick wet again?"

That Thursday night Sam and Kate have dinner over at their parent's. This time Kate invites Frank as a form of 'Hello everyone we are dating now. Which went over well with Kate's parents, which was helped by the fact that they didn't know she was pregnant yet. However, Sam wouldn't stop staring at Kate the whole time during dinner.

Kate panically thought, 'Oh shit, he is going to try to tell me about that night after dinner.' So she secretly texted Frank under the table, " I'm afraid Sam might try to talk to me right after dinner, so Make sure you pull him off to the side RIGHT after dinner and tell him he can get another crack at the girl this weekend if he wants. This should be enough to keep districted" But in reality, Frank know this was Sam first time seeing his sister since that night, and all he was trying to picture her in the latex outfit again, but now if he doesn't tell Sam that Kate might think something is up.

So right after dinner, he grumpily pulls Sam to the side, and without saying a word, secretly shows him Kate's messages. Sam answers him loudly enough for Kate, who is on the other side of the wall to hear, "I'll be an idiot to ever pass that up."

Kate swivels at was she just told her new boyfriend to sit up, but in her mind, it was the only way. As Frank rounds the corner alone, she looks him dead in the eye "well, you better wine and dine me well tomorrow."

Frank smile at her "Of course always."

to the end

At first, Kate parents were pissed when they found out that she was pregnant, but when Frank offer to marry her, the whole issues blow over quickly. But of course, even after that, the arrangement never ended. So much so that on their wedding night Frank actually slept alone while Kate had her pussy stuffed with a fake blindfolded Sam's cock.

This continued for so much that after Kate became pregnant with her second child Frank wasn't even sure it was his. Frank was too blinded by love for Kate to care that there is a strong chance that neither of her kids could be his. However, To prevent the risk of getting knocked up by her brother again, Kate got her tubes tied as soon as possible after the birth.

So, in the end, Sam did fail in his objective to make Kate take up responsibilities because Frank ended up supporting her. However, Sam did end up getting a pussy he could fuck at a minimum once a month to a maximum every day of the week.