READING ACTS: The Testament of Reuben. Phil Long mentions a number of New Testament passages that can profitably be read with the Greek Testament of Reuben. Its association of the angelic watchers with the idea of women as seductive temptations also makes me think of 1 Corinthians 11:10, on which more here.
I would be very cautious about using the Greek Testament of Reuben as Jewish background for any New Testament text. But it is source of information for second-century Jewish-Christianity which can be usefully read alongside the New Testament.
Earlier posts in Phil Long's blog series on the OTP are noted here and links.