I'm gonna agree with stedric...strawberries....also cucumbers (notice how it has the word "cum" right in it)...cucumbers have sugars like strawberries, but the sugars in cucumbers aren't as acidic, so your cum won't be so strong, but sweet.

As far as blue balls, well, yeah, jack off dude....if she cums before you, don't have her give you head after you've had a condom on....another reason your precum tasted so bad was because it had been heated up after sitting in there for so long....it gets really wet and sticky and nasty when it gets hot...that's why your cum gets clearer and clearer the longer you wait to cum....sperm die in heat...so if you don't get to cum, just have her put a little lube or spit on your cock and have her jack you off...maybe, MAYBE, if she's into it, cum on her, but WIPE IT UP FOR HER...