From the last story.
Mary asked if Allan would model for an adult group with things being much more sexual. He discussed it with me and went for it.
When Allan turned up he was introduced to Rebecca as the other model for this period. She told Allan that this was very much an adult group and that they would be modelling in sexual poses which would include oral sex.
Allan and Rebecca chatted and it turned out she had done this before where Allan was a novice. She told him that he would need to be hard for the setting and that usually she would be holding or licking him and would provide the necessary stimulus. She, on the other hand, would not need, but would enjoy it if Allan would help to keep her stimulated as the nipples stood up and her skin tone was improved.
Mary called them in and they took off their robes before entering the room. The artists applauded them for being their models and Mary posed them with Allan on his back and Rebecca over him just touching his hard cock with her tongue and sitting almost on Allan's face where he could flick his tongue out and keep her motivated.
The group was twelve artists five male and the rest female, they weren't there to play games as the college girls had been this was serious artistic work. They set-to immediately and with little talking they sketched and painted. The models would only have 30 minute stints as keeping their positions can be very hard (pun intended).
True to her word Rebecca kept stimulating his cock with her tongue and he kept darting a flick at her clitoris so the juices were evident at both ends of the 69. After thirty minutes they took a break and for the last five of that Allan wanked to maintain his erection.
Once the session was over and they were in the annexe Allan and Rebecca helped each other to orgasm. As they got there Mary poked her head round and caught Allan's money shot. With a smile on her face she said that she hoped she could incorporate that in a pose but they would need a fast camera to see it happen.
The next week same pose and same result but week three Mary asked for them to be in the cowboy position with Rebecca sitting on his pole. She kept pulsing her vagina and his cock stayed rigid. Once the session ended they just had full on sex on the podium to another round of applause from the artists. I benefitted from this as Allan was really randy after performing for an audience.
Week four no change in the pose as they had to finish what they had started but the ladies kept making comments about Allan keeping hard for so long. The men were eerily quiet about it all. Quite a bit of conversation was going on between the models and the artists. There were a couple within the group. Paul and Frieda, and the wife was interested in how Allan was allowed to do this. Wasn't his wife jealous?