Came is the past tense of come, which means to move toward something (and various other things). It is not, however, the past tense of cum
. The past tense of cum is cummed
. Look at the word hang. When you hang somebody (as in a form of execution), you hanged them, not hung them. Same goes for cum. It is a different word and meaning so it is cum, cummed, cumming, will cum, et cetera.
I came over to Erin's house last night and played video games.