Afraid to hurt him?

Pretty simple, I'd like to try the cowgirl position with my guy. I am not ashamed of the way my body looks and I know he likes every inch of it BUT I am kind of afraid to hurt him in that position because he is pretty skinny (probably around 150lbs) and I am a curvy girl who weighs 215lbs (5foot7).
How can I ride him good without me hurting him or just being too heavy?
Afraid to hurt him?
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