First: I used the "strenghten Present 1" and till now I didn't come in contact with "vem" and it's other conjugations. The only thing was "voltam" (come back). I make notes of everything, so I can look back :-)
Second: In which contexts can I use it? Since the majority here thinks of a sexual one first lol, I can't even think about a better context now :-D
Oh, wait! Mother to her daughter, they want to drive to the city: "Are you coming now? We have to hurry!"