YOU SAID:
i got to first base with her
INTO JAPANESE
私は彼女と一緒に一塁に着いた
BACK INTO ENGLISH
I arrived on the first floor with her.
INTO JAPANESE
私は彼女と一緒に1階に着いた。
BACK INTO ENGLISH
I arrived on the first floor with her.
That didn't even make that much sense in English.