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).