Aaron has cummed on Jen while kneeling over her between her legs. He shows her that SHE turns him on. You cum on yourself while Jen tells you what she does with Aaron. You show her that what she does without you turns you on. These are very different messages. Sahara wants you to experience being a cuck. But if you don't better satisfy Jen's needs and show her you love her more than you love having her do things for you, you won't be a cuck. You'll be an ex-boyfriend. It is time for you to give her some naked loving to show her you love her for who she is as well as for the things she does at your urging, and so you are not left far behind Aaron who is giving her love.
You want Aaron to be in her first. Don't worry, he's going to do that. You need to love her and give her an orgasm. If you are not first with that, she may never orgasm in your presence. You will have lost her.
Jen wants you to see her naked. She is "ready" Make sure you see her naked during Thanksgiving. And make being naked together happen more than once.
You seem to assume that after months of loving sex with Aaron, and/or with years with other boys, she will come back to you and marry you. I don't like your odds of this dream coming true. Now you know her best, including current events, and she can trust you with her secrets. Aaron is already supplanting you in this trusting intimate conversations arena, the arena that builds relationships. Aaron has already told and showed her that he wants to, and expects to, be in love with her. What you have been telling her recently is your needs, and demands that she share details of her activities with Aaron; sharings she finds embarrassing. What's in it for her? Do you talk to her about her fears of satisfying some hard professor's demands? Or how she's getting along with her roommate who doesn't like you? No, Aaron will help her with these. Once she feels more support, emotional intimacy, and safety with Aaron than you; you are outta here. The day she eats pizza with him while he looks at her bare pussy; you are outta here.
You need to takes steps over Thanksgiving to stay relevant.
Regarding getting to Jen's pussy: You want Aaron to fuck her first. OK, we hear you. Jen's heard you. But what does Jen want? She's made it clear she wants you. And now! "I'm ready." She blocked Aaron's pussy rubbing. She saved that first for you. Give her that rubbing she wants. It's not a race. It's meeting Jen's needs as well as your own.