Okay, I have brown nipples, not small, but also not really big.
I lost my first nipplefight against a girl with very similar sized (and colored) nipples (and tits). I guess I lost mostly because I felt overexcited and could not keep myself under control. It was probably just a minute until mine were completely soft and pushed back into my dense tits.
I won in the same way against very small pinkish nipples (on bigger boobs than mine). But only the first time we fought.