You'll be fine... you can control the penetration, the speed, your orgasm better and as long as your legs don't give out... you may find out that for many of the reasons already mentioned by the others, he'll like this position quite a bit! Give it a chance, it might just be fantastic for you both!

~peace~

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"I believe in nothing that I cannot touch, kiss, embrace.... The rest is only hearsay." ~E. Abbey