Matsya Purana — Inquiry into Yayāti’s Story and the Kacha–Devayānī Episode
नित्यमाराधयिष्यंस्तां युवा यौवनगोचराम् गायन्नृत्यन्वादयंश्च देवयानीमतोषयत् //
nityamārādhayiṣyaṃstāṃ yuvā yauvanagocarām gāyannṛtyanvādayaṃśca devayānīmatoṣayat //
Ever attending upon her, the young man—moving in the sphere of youth and charm—pleased Devayānī by singing, dancing, and playing music.
This verse does not address Pralaya; it is part of a dynastic/romance narrative describing how Devayānī is pleased through courtly arts.
It reflects a household/courtly ideal of attentive service and pleasing conduct—using refined arts (song, dance, music) to maintain harmony and affection in relationships.
No Vāstu, temple-building, or ritual procedure is mentioned; the focus is cultural etiquette and the performing arts within a narrative setting.