We indulged in conversation and drink.
Watashitachi wa sake to kaiwa ni fuketta.
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)
at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although
to indulge in; to give oneself up to; to be obsessed by; to be engrossed in; to be lost in; to be absorbed in