Biceps is always biceps (though if you’re speaking of both biceps, it could also be bicepses, but that’s kind of awkward, eh?). You have a biceps on each arm. There is no bicep. It is a biceps muscle. Actually it’s the biceps brachii if we’re getting really technical. Shortened version: biceps. So, she grabs his biceps. Even if she’s only grabbing one arm. Got that?

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