A stock phrase in Japanese pop culture supposedly used by the wife in a newly-wed couple to invite her new husband to bed.

prostitute

Kyūjitai form of 私生児 (“illegitimate child”)

vicissitudes, the way that the world or a person prospers one day and declines the next

dotting the i's and crossing the t's

You should treasure every encounter, for it will never recur.

successive series of questions and responses

one part

Used other than figuratively or idiomatically: see 一 and 本 (one thing) / Short for 一本勝ち (ippon-gachi, “winning in one blow”).

the first / (mathematics, attributive) the quality of being first-degree