Looking over Rachel, then the chocolates, Mark gets an idea. Although tiny right now, Rachel's dick nipples haven't gotten a very good treatment. Reaching into the box, Mark pulls out a dark chocolate nipple and a dark chocolate vagina. He eats the first one, then looks down in time to see his nipples pucker up, then split to form one vagina each. It was somewhat small, so he repeated the process until it looked like a good size. Meanwhile, Rachel was preparing her dick nipples for their initiation, sizing them up to a respectable 9 inches. Looking at her dick nipples, Mark ate one last combination before getting ready.
"I've never had a pussy before," Mark said to Rachel.
"Well, you don't have clits, so it's not quite as fun, but here's how you do it," Rachel replied and got ready to show Mark the joys of the vagina.
"First, you take your hand and start to rub in circles. Once you're worked up, you need to take 3 fingers, or as many as you can, and start darting in and out," Rachel demonstrated first, Mark giving off a moan as his left pussy was stimulated by the girl. "Come on, Mark, you can do it," she cooed, and brought Mark's hand to the right one. Autonomously, he started the motions, at which Rachel spoke softly, "there you go, Mark."
At this point, Mark was self-lubricating both his pussies. Rachel saw this and whispered, "Alright, Mark, now for the main course." She positioned herself so that her now-rock hard dick nipples were facing his pussies. She had to eat a few height chocolates to get them at the same level, then said, "here it comes!"
Rachel thrust hard into the two no-longer virgin vaginas, breaking the hymen. Mark gave off a grunt of pain and a moan as his pair of pussies were violated. Rachel's nipple cocks went all the way in, and her speed continued until she bounced off her own breasts. Pulling back for another shot was interesting, as there was some resistance holding the two in place. After pulling back, but not far enough to let the two escape, she thrust forwards once more, her two breasts compressing as her twin manhoods fought the re-entry into the cavities.
Thrusting back and forth was a vigorous affair, and Rachel was beginning to tire even though she had only been doing it for a minute or so. Thrust forwards, hit the stopping point, return, and repeat. Back and forth, back and forth, both of the pair letting off sensual moans as their unusual anatomy pleasured them. Rachel could feel a stuffyness building up in her breasts, as if there was something that wanted to get let out very forcefully, but something was holding it back. The sensation continued to increase until finally, she released her load into Mark's pussies, letting of a satisfied yelp. Mark was also feeling alien sensations as he grew closer and closer to the orgasm. He finally peaked, squirting out his own juices in reply to Rachel's.
Both of them came to rest on the downstroke, breasts squeezed between them but still held together, where the two fell onto the bed and cuddled. After several minutes, Rachel decided to leave the embrace, and pulled out her now-soft nipple dicks. The fluid that they had on them wasn't exactly semen and didn't look like it, so she wiped some of it up with her finger and tasted it. The taste was a combination of Mark's vaginal fluids and her own breast milk, which was unusual, but not really, she thought.
"Mark, these cum breast milk," Rachel spoke softly, and held up some to Mark's mouth for him to try. Licking it off her finger, he hummed in agreement and looked satisfied, both at the milk and at the afterglow.
After this, they...