Teufels Küche literally translates to "devil's kitchen" and is part of the German idiom "in Teufels Küche kommen" (to get into the devil's kitchen), meaning to get into serious trouble or a difficult situation.
In the song, the phrase is used to describe the dangerous and forbidden territory of their growing feelings. The singer warns, "Sonst kommen wir noch ins Teufels Küche" (Otherwise, we'll get into the devil's kitchen), highlighting the risky nature of their hidden emotions and the potential consequences if they give in to them. It's an evocative and memorable idiom that adds a dramatic flair to the lyrics.
"Für Gefühle kann man nichts" means "you can't help how you feel." The song is about a forbidden attraction: two people who know kissing and even a deep look are off-limits, but they can't stop themselves.
The verses set the rules: they've promised not to give themselves away, not to dance in the same room, not to look each other in the eyes, because they know exactly what happens next. The chorus is the excuse and the confession in one line: feelings don't follow the rules, whether it's about truth or duty, wanting or giving something up. Once something is out in the open, it can't be hidden again.
By the end, she asks him to leave without her, because if he looks at her, he'll break her heart all over again. It's a song about wanting someone you're not supposed to want, and knowing that no amount of self-control changes what you actually feel.