This makes me wonder how much of a change the average, normal woman is going notice after a year or more apart from a guy who ended up getting injections. You have "modest" , "significant" and "undeniable" changes. My hunch is most women who've had a long enough time apart from a guy who later got
PMMA usually wont notice modest and some significant gains... my hunch is they don't dwell on our
Dick's nearly as much as we do and, short of a massive change, probably chalk it up to a stronger
Erection.
Like up to 0.5" I feel is modest, 0.5"-1" is significant, and anything more than 1" is undeniable. There are a lot of other variables, like if she's already a snug fit, a modest gain may be more noticeable. Perhaps you can share with us your final result (your signature says a 7/8" gain in circumference) and her vaginal type & sexuality? Might hint us to whether or not you'll even have to make an excuse, OR, the nature of the excuse if she asks.
Even though we're missing some variables, here are two options that come to my mind:
I'm assuming you haven't hooked up with her for a while because you mentioned the "doing PE for years" excuse. If this is the case, you can legit act like nothing's changed. You could give her an awkward look like she's crazy and laugh with a "thanks!" and brush it off like you don't notice a difference. Throw in a "my
Erection quality has improved with diet and cardio" and she'll chalk it up to cloudy memory.
The other option (especially if she's the kind that does notice and chooses to investigate), is to go with injury excuse like justn8 recommended. "Scar tissue" and "plaque" (like in Peyronie's) may have thickened the shaft, and your "
Urologist said so." I doubt she'll ask anything else other than "is it okay?" and "does it hurt?" and tell her it's fine and it shouldn't get any worse.
The fact that you feel the need to make an excuse (and that's OKAY, I think most single men would) indicates that your best bet is not to reveal any sort of penis enlargement endeavor.