The look on her face was enough motivation to keep him going. Sam sort of half wished that he could watch when he did all of this, but as he had to take care of her he would only spend his time imagining with every move that he made. Tipping his head to the side, Sam licked at her slowly, the taste of the chocolate mixed in with pure her turning out to be a surprisingly pleasing combination. Sam scooted forward, pushing his tongue in, combining the process of seeking out more taste with the task of making Ruby squirm in every way possible until she broke entirely.
This was about her. As far as Sam was concerned, it was always about her. Because making it fun for Ruby only made it twice as fun for him. He liked being in charge of her. Sam liked watching her struggle against the hold he had on her. Ruby might have been able to hold down her place with other men, but Sam was different. He was more than happy to prove as much to her too.
Sam dragged his tongue in and out, happily taking his time with the procedure so that Ruby got a full ride out of it. She'd thank him for it later.