How in the hell do you retroactively work out the timeline of all of this? When did Gwen sleep with Norman? During what time span was she pregnant? When did she have the kids? Why didn�t she ever show? When would she have been gone for such an extended period of time to have the kids?
Frankly, I can't do it.
. . .
Essentially, you have to be pretty flexible with Spider-Man�s continuity to make things fit.
. . .
Let's return to the events of issue #60. Gwen is seriously depressed, angry, and hurt about Peter's perceived treatment of her father and has thrown him out of her house telling him she never wants to see him again. But her trials don't stop there. Bam - there's a picture on the front page of The Daily Bugle showing Captain Stacy committing criminal acts - with the photograph taken by none other than - Peter Parker! Not only does this make her even angrier at Peter, feeling doubly betrayed but now it appears that the man she's loved and adored for all of these years may even have been a criminal and kept numerous secrets from her!
And just like those bad infomercials say "But wait - there's more!" Captain Stacy decides to flee, over Gwen's protests, but the Kingpin, taking no chances, sends his goons out to the airport to take Gwen and her father prisoner, bringing them to Winkler's lab at Oscorp.
As she clearly realizes that she and her father are in mortal danger, Gwen is subsequently bound and gagged by the Kingpin's goons, compounding her feelings of helpless and fear. Being gagged, she doesn't even have the small solace that being able to talk to her father, or attempting to reason with the Kingpin and his gorillas, might bring. Suddenly, Spider-Man bursts in to try to save the day, but Winkler holds him at bay by pointing a gun straight at Gwen and her father threatening to kill them. Can you conceive what could have been going through the mind of an 18-year-old-girl whose world and life has been turned upside down over the last couple of days, and now is totally helpless and facing death?
And then all of a sudden, guess who comes to the rescue? Norman Osborn, seeing that the light in Winkler's lab is still on, grows increasingly suspicious, and decides to check things out. He is horrified at the scene that greets him and takes decisive action. Admittedly, Osborn's action against Winkler prompts an accidental firing that creates another jeopardy, but within a minute it's all over as Spidey is now free to do what superheroes do.
However, in the rush of excitement, the arrival of the police taking statements, and Norman's temporary incapacitation due to his increasingly painful headaches (after seeing a picture of the Green Goblin, he has become steadily more troubled) and proximity to the resulting explosion at the lab, Gwen probably does not get the chance to express her gratification to Norman for saving their lives.
Remember in issue #512 when Gwen tells Mary Jane that she had gone to see Norman "on another matter"? What would prompt Gwen to see him on her own initiative? I suppose one could think of a number of things, but it seems likely that she wanted to personally and properly thank Norman. And I'm sure that's ALL she had on her mind.
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So, I've hypothesized that between issues #61 and #64, Gwen Stacy has gone to thank Norman Osborn for saving her and her father's life. She can gain ready access to Osborn due to his longstanding friendship with her father, her friendship with Harry, and the fact that he has known her since she was a small child.
. . .
You have two adults (admittedly one is more than twice the age of the other) who are probably each at their weakest and most vulnerable - and something just happened.