Meet at your place and discuss rules.

Hour later you hear a door bell. You let Lora to your guestroom and both of you look on each other, examining your/her future sexual partner.

"You are lot nicer than I expected. Why do you listed as a chubby?" - ask you. "I would call you gorgeous." - add you with a discreet look on her boobs and butt.

"Thank you, but your flattery won't help you." - smiles she. "Let's talk about what do you want."

"I like a straightforward girls." - smile you back. "Shortly, I would like to introduce you to my friends, they are three couples, as my it's-a-serious-relations girlfriend and thus, join their swinger club."

"Wow!" - says Lora after a pause. "That's really new thing to me. So, you want to trick your best friends and fuck their wives, right?"

"Yeah, even if it sounds insidiously. Actually, one of the girls gives me that idea. Other don't know yet, that I know about them."

"I got it." - says she and lick her lips. "So, you want me have sex with you and three your friends. Vaginal, oral and... I think you do want to have anal sex with me. Do you want me to do it with your friends as well?"

"Errr." - you are a bit surprised with this confidence. "Yes, I think so, it would be unfair, because I do want to have anal sex with their girls. What about threesome? I don't know if they do it but let's talk about it."

...

After some time you make an agreement. She lives with you and pretends to be your girlfriend. You will have regular sex with her and she will sleep with your friends. It will cost you decent amount of money but it won't take your savings, you just to have cut your bars, clubs and other similar expenses. It's a good deal for free regular sex with big-boob girl. And you will pay Lora extra rewards for every anal and threesome. As a gift she agrees for bondage and throat-fuck for free. You can bet that she enjoys it.