Broke guy trades his ex-girlfriend for money to his promiscuous friend

Our protagonist, a guy with a rather modest income, has a friend who is a real sex maniac. He has a girlfriend who, it would seem, is not at all interested in sharing her boyfriend with another girl. But our hero has a plan. He decides to offer the guy to sleep with his ex-girlfriend for a large amount of money. The guy agrees, and our hero brings his ex-girlfriend to his friend's house.The girl comes, and the guy offers her to have sex with another girl for a lot of money. The girl thinks about it, but then agrees. She doesn't really mind trying something new.The girls start undressing each other and caressing. Then one of the girls takes out a dildo and starts fucking the other one. After that, the girls suck each other's nipples and have hardcore sex. Our hero watches this whole time. At the end, the guy gives our hero a large amount of money, and he is satisfied with the result.