The next Tuesday when the girls got to Deb's house Susan opened up the package of artificial cum and read the directions. The material had to be cooked for optimum performance, so she and Deb cooked up a double batch.
"Are you going to make me swallow all of that?" Deb worried.
"No, but if I am going to give you a realistic feeling of a guy cumming in your mouth I need to practice on myself first, to get the proper feel for squeezing the bulb, I don't want to choke you, just give you the typical sensation you will feel."
After cooking up the cum, Susan put the pan into a bowl of water to cool it down. When it was just over body temperature Susan poked her finger into the goopy fluid and stuck it in her mouth.
"Not bad, a little like the real thing, but cum tastes better, here." Susan poked her finger into Deb's mouth.
"MMM, not that bad, but definitely not ice cream," was Deb's remark.
Susan filled the bulb and put the dildo in her mouth. The first try she got way too much, but after adjusting her grip on the bulb she found she could approximate the typical male release. Susan refilled the bulb and wrapped it in several layers of towel to keep up the temperature.
"OK Deb, I'm going to have you just do the swallow first, so you get used to that before I have you go through the whole process, OK?"
"OK." Deb got down on her knees and put the dildo in her mouth.
"OK Deb, now move like you are trying to make him cum, I'll give you a signal, then start squeezing and you just keep gently sucking and swallowing the cum. Ready?"
"Mmmhmm." Deb was going to town on the dildo."
"OK, be ready, here it cums!" Susan started squeezing the bulb rhythmically, Deb paused at first, then swallowed and began to suck the dildo and swallow the cum just as Susan had told her to. After a few squeezes the bulb was empty and Deb had swallowed all the fake cum. She let go of the dildo and asked Susan, "How was that?"
"I think you have it, I'm going to get a refill and we'll do it once more, but go through all the way, with my guiding you."
Susan padded naked out to the kitchen, and noticed the fake cum had cooled off, so she gave it a moment in the microwave to warm up before filling the bulb. She came back to the living room and sat on the chair and motioned Deb to start sucking again.
Susan had Deb spend some time slow sucking the dildo, 10 minutes perhaps, then told her to pick up the pace and make her cum. Deb started in really working her mouth on the dildo, and the motion started to stimulate Susan's pussy. Susan got quite aroused, then figuring Deb had enough, she told her to get ready and started pumping the bulb again. No hesitation this time, Deb just sucked gently and swallowed the artificial cum down without losing a drop.
"OK, let's clean this stuff up and get dressed, on Thursday I am just going to let you go at it with no coaching and see how you do, but I really think you will be ready to suck Bill's cock on Friday."
"Susan, I am really getting into this, sucking and swallowing, it's making me hot!"
"Good, sucking cock makes me hot and horny also."
After cleaning up the toys and putting them away, the girls enjoyed a big glass of wine before Deb took Susan home. As soon as she walked in the door her daddy have her a big hug, then just held her for a moment and sniffed. "Why do you smell aroused Susan?"