My initial notes, just bits and pieces in no particular order (and possibly completely unintelligble), are under the cut, and I will add to them as we go along.
1. When I started this, I knew I wanted TimeLord!sex to be the hook, and I felt like telepathy (while awesome) had been done quite a bit, so I tried to come up with a variation on it that was a bit unusual. The "stare into your partner's eyes for five minutes thing" is one thing from my college Human Sexuality class that I've never forgotten, so I decided to go with that. (And yes, I have actually done the five-minute stare with someone before, and it is kind of scary and amazing. If you have a significant other, give it a shot!)
So, one thing I did that I hoped no one would consciously notice on the first reading was put in a LOT of references to where they were looking, whether they were making eye contact, etc. I shudder to think how many hits you'd get if you searched through the story for "eyes" "look" "see" "gaze" etc. They're probably half the total word count. :)
2. Which leads me to the title, which made me so happy when I found it, I giggled for hours. The thing is, I *suck* at titles, I really do. So I went with the old standby, which is picking a word and translating it into another language and using THAT as your title, because other languages are sexy, right? So I went with "see," and first tried French, but the result was too close to "voyeur," which, while sexy, was not what I was looking for. So I tried Latin, and found "sentire," and was just thrilled to see what else it meant, because I think ALL of those words (experience, feel, perceive, see, think, realize, understand) are clear themes in this fic.
3. The OT3 issue. Alas. Honestly, I went back and forth about whether to make it absolutely clear at the very beginning that despite the presence of three-way smut, this was NOT an OT3 fic. I decided against it, because I simply don't like to give anything away, but for anyone who felt misled, I'm really sorry. I'm a big fan of OT3, but I'm angsty by nature, and I personally find true (and by "true" I mean "in character") OT3 very hard to do well, what with all the "I love you" "and I love you" "and I love you" that has to be dealt with. :) It just wasn't the story I wanted to do. I do love Jack as much as anyone can, so I was very careful to try to make sure he was okay -- the benefit, I think, of working with pre-Torchwood Jack, who I think moved very easily between the circumstances of sex without love AND love without sex.
4. The Doctor and Rose never say "I love you" to each other, and this was absolutely on purpose. First of all, it's Nine. I mean, really. Second of all, I tend to go for the non-obvious obviousness, meaning, I wanted it to be absolutely clear that they love each other deeply, to the point that saying it would be reaching through your computer screen and smashing you over the head with a socket wrench. In my canon-view, Nine would never say it, and Rose would never expect him to. (That's what Ten was for, yeah? :)
5. I feel like this should be a post all its own, but hello, overkill. So let's talk about The Part Six Event.
(1) I am incredibly uncomfortable with the idea that what happened to Rose was on par with rape or abuse, though I did want what happened to her to be powerful. I think I have realized that I just couldn't have it both ways. :) The thing is, I personally don't believe that anything that happens unintentionally in a sexual situation must be construed as violative, even when it results in harm, though I don't have a good argument against anyone who says otherwise.
(2) Having said that, there's a big question about whether what the Doctor did was, in fact, unintentional. He meant to do whatever he has to do to enter her mind, but he never, ever thought it would work. It'd be a bit like putting on a Superman Halloween costume and discovering you can fly, meaning, he had ZERO expectation that it would happen. I think this mitigates his culpability somewhat. Not entirely, but somewhat.
(3) One thing that really struck me about what people reacted to was that I never thought it was that big a deal that he left her with Jack. According to the comments, though, a number of people were shocked by that, and it made me go back and try to remember what *I* was thinking when I had him leave. It's mostly because between Jack and Nine, it's obvious who's going to be doling out the comfort, and I honestly thought Nine would have been very confused about why this was happening. Also, though at the end of the day I do believe he's always going to do the right thing, the Doctor fights a biiiig demon called Cowardice. In the heat of the moment, sometimes his fight-or-flight reaction is going to be wrong.
(4) Here's something I also take as canon: Rose trusts the Doctor. That trust is absolute, 100%, no exceptions, no caveats, no gray area, period, the end, game over. In my head, she'd never be angry about anything he does to her (condemning her to death in a bunker with a Dalek, say); she'd only be angry that he didn't tell her what was going on. Hence the reaction in the bath.
(5) Ooh, the bath. Someone made an off-hand reference to the idea that the Doctor was making Rosetell him what happened purely out of cruelty. I actually had him do this for a couple of reasons; first, I think he is hoping against hope that what happened didn't happen, and by having her explain to him, he's confirming that it did. Second, he's forcing himself to face the pain he caused her.
And one thing I think I did not write well is WHY he doesn't tell her what happened right then, in the bath. In my head, it was because it's an extremely complicated answer, and he wants to make sure he gets it right. He's still trying to process what he did, how and why it happened, and I felt like having him try to explain everything right then, it would have ended up being "I tried to have Time Lord sex with you and I never thought it would work but it did and I'm sorry," or (from a purely practical storytelling perspective), it would have taken as long as it did on the beach at the end, they'd have been cold and pruny by the time it was over.
What else, what else?
(6) I joked about this a bit in the comments, but the Interlude drove me absolutely batshit. I remember writing to my beta in frustration because I felt like it kept devolving into either Harlequin Romance or Letters to Penthouse, neither of which do I consider to be good writing. And I felt like that scene was important to the story, their first time together as a threesome. My problem is that my writing process is very visual. I actually do quite a bit of writing in my head and will usually have the entire scene "finished" -- where the characters are, how they move, and what they say -- before I ever put anything down on paper. I couldn't do that with the Interlude because it was too damn long. Not that sitting around imagining these three in bed was a big damn chore, but there's so little dialogue involved, and I felt like I had to describe almost every single movement in order for it to be realistic and compelling, and it just ended up being ridiculously long.