Wow, this sure blew up more than I thought it would!
It's a bit annoying to me because, frankly, I can see both sides of the argument. On the one hand, speaking as a fellow "I don't like taking the dick" individual, I can see the point being that if your character is portrayed as being in love with Ryn and she with them, then the confession being locked behind receiving dick from her could be a bit frustrating.
But, on the other hand, speaking as a "I enjoy Ryn enough as a character that I make an exception for her" individual, it also makes perfect narrative sense. Here, at the absolute turning point of her life, when she finally receives freedom and the option to live her life as she chooses, she wishes to have her first experience with the part of her that's been locked away with the person who means more to her than anybody else - you. Can you imagine how it would feel to have that denied? Even if the feelings have not changed, even if she still loves you, it makes perfect sense to me that it might slightly ruin the mood and make her hesitant to make any sort of confession.
To me, this is one of those cases where I try more to focus on what my character would do than what I would do. And I choose to think that if my straight, no-dick-please character loves Ryn as much as he's supposed to, he's very much willing to make an exception for her because of just how much she means to him; it's a sacrifice he makes for her sake, which is a fundamental part of most successful relationships. And in so doing, he thoroughly earns the confession, and cements his already hard-earned place in her heart.
Just thinking out loud with this.