pwede lang man cguro masu form lang ang gamiton among us.. in a way medyo closely acquainted na man hehe...
kung friends, plain form.
the very polite forms are used for people who are older than you and you just met recently (like for the first time, or 2nd time maybe) or with people who hold higher positions in the workplace.
samokanchan (hehe) mou kekkonshitaidesuka? do you already want to get married?