Honestly, the only one who can tell you the best way to pleasure your boyfriend is your boyfriend; people don't all like the same things during sex and the best thing to do here is to have a frank conversation with him about how he feels about the sex you're having right now and what, if anything, he might want to try or do differently.
Also, this might be a good time to talk with him and have a general checkup about your relationship in general - sometimes stresses in other areas of a relationship can impact someone's feelings about sex.
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