You have a weight problem...
NiceTallGuy said:
I'm 36, my wife is 31, we have been together for 12 years.
Congratulations!
NiceTallGuy said:
My dick is small and thin [so] I started using a strap-on dildo in a harness. My wife likes the feeling of it.
So far, so good...
NiceTallGuy said:
What does this mean...?
NiceTallGuy said:
I asked my wife if she would like to fuck [other] guys and she said no, I'm the only guy she has ever been with.
That was a predictable response...
NiceTallGuy said:
She said now that she has felt a bigger dick she does think about other guys some now.
Ah ha... your wife is cautiously allowing her sexual curiosity to emerge (or some of it, anyway)...
NiceTallGuy said:
She said she is worried that her pussy will get stretched out from [men with big] dicks. A pussy just returns to its normal size after [a woman fucks a man with a large cock], doesn't it?
I think Ms. Katie and Soon have more-or-less answered this question. An interpretation of Ms. Katie's reply would be that a woman's pussy returns to its normal size after she fucks a big-cock lover (although not instantly; some time is needed presumably) — but, psychologically she comes to associate heightened and intensified sexual pleasures with men who have relatively-large cocks.
BTW, I think it's "fair and reasonable" to say some women... perhaps a substantial percentage... have upper limits. That is, not all women find it pleasurable to fuck men with gigantic cocks. Some, perhaps quite a few, just find it painful.
NiceTallGuy said:
Any ideas what I should do now?
1) Purchase a strap-on harness that you can use with realistic penis-like dildos of progressively-increasing size, then gradually step up to larger dildos to see if your wife can accommodate herself to them and whether she finds them more pleasurable.
2) Alternatively, obtain a realistic penis-like vibrator dildo of a size your wife finds pleasurable, then give her cunylingus while using one hand to fuck her with the (well-lubricated) dildo. Then, step up to larger size dildos to find out whether your wife can accommodate herself to them and whether she finds them more pleasurable.
3) At 6 ft. 2 in. and 250 lbs., your body mass index (bmi) is 32.1. That's in the obese range. (The ranges are: normal, bmi = 18.5 to 24.9; overweight, bmi = 25.0 to 29.9; obese, bmi = 30.0 and above.) The formula is:
bmi = {(wt. in lbs.) / [(ht. in inches)x(ht. in inches)]} x 703
or:
bmi = (wt. in kg) / (ht. in meters)(ht. in meters)
see (e.g.):
Healthy Weight: Assessing Your Weight: BMI: About Adult BMI | DNPAO | CDC
Thus, you need to begin a serious weight-loss program. As you lose weight (significantly), your penis will begin to look larger to your wife and perhaps feel larger — or at least somewhat longer — as well, because now it's almost certainly partially buried in your belly fat. In other words, as you lose weight your penis will begin to "emerge."
Your present state of obesity is also endangering your health. As you lose weight (if you do), you'll begin to look more sexually-attractive to your wife.
I'm Love HUMILATION for having a short thin dick. She is not some much into it but with biger dildos she is seeing how good a big dick could feel. So she don't want a loosed up pussy, we also have two kids. She is still tight but what's to stay tight, I would love her to losen up so she can luagh at me when my small dick go's in her. 
