Дотемна is an adverb formed from "до" (until) and the root "темн-" (dark), so it literally means "until it gets dark".
It’s a poetic, somewhat old-fashioned word you rarely encounter in everyday speech. In the line «Пропаду в них дотемна» JONY says he’ll lose himself in her eyes until nightfall, creating a vivid, romantic image that makes this uncommon word unforgettable.
Russian pop sensation JONY mixes smooth English hooks with warm Russian verses to build a cozy, romantic shelter from the outside world. He starts off by admitting "Без тебя мне холодно" (Without you, I'm cold) and wandering over with zero excuse ("Иду к тебе без повода" / I come to you without a reason). When he looks at his partner, he drops a fun pop-culture comparison: "Твои глаза / Целый мир как Нарния" (Your eyes, a whole world like Narnia)—referencing the famous fantasy world hidden behind a wardrobe to explain how easy it is to get lost staring at her.
The real heart of the track is how her voice protects him. Outside, there is a literal or emotional storm raging—"Буря, буря за окном" (Storm, storm outside the window)—yet it cannot touch them inside. He leans on the catchy, repeated English refrain "My baby I love your voice" and trusts that "Твой самый нежный голос меня спасёт" (Your most gentle voice will save me). It is a sweet, upbeat love track that treats one person's voice as the ultimate safe haven.