You and your wife want to start a family, but she was unable to conceive so you hired a surrogate to help you. She suggests that you impregnate her the "old fashioned" way and have fun during the process. She'd be sure to tease you, to fill your head with dirty thoughts of breeding her, so that you cock would get hard and your balls would become swollen with cum. She would stroke, suck, then fuck your cock, eager to get every last drop of your seed deep inside of her. She couldn't wait to be pregnant.