Hi,
First of all I must congratulate you for having a good libido after 10 yrs of Type 2 DM. You are fortunate for the following facts:
1) To get an erection, men need healthy blood vessels, nerves, male hormones, and a desire to be sexually stimulated.
Diabetes can damage the blood vessels and nerves that control erection. Therefore, even if you have normal amounts of male hormones and you have the desire to have sex, you still may not be able to achieve a firm erection.
2) Pt's with Type 2 DM usually suffer from -
Premature ejaculation, where as you are c/o delayed ejaculation and that too with good libido.
If you can't release your semen by regular intercourse -
1) Start intercourse only after fully aroused mentally (even though you have good libido) and think only sex (in any form) during intercourse
2) Oral and other ways can be tried.
When God has given good libido and delayed ejaculation don't you think that it is too much to ask for a second erection within 1hr.
Consider yourself that you are sex wise extraordinarily benefited and get satisfied and content with that.
Best wishes