The speaker is thinking about love as something that happens by accident, not by plan, and decides the sensible response is tenderness. Their heart is "rogue" and tied to October, which suggests a love arriving late in the year, or late in life, unruly and out of season. Instead of scolding it, the speaker imagines treating it to dinner, as you might a wayward friend.
The tone is wry and warm. Calling the heart "all good and hot / like a devil" mixes appetite with mischief, and "my private sin" hints at a desire the speaker doesn't quite want to announce. Yet the final lines don't sound ashamed. The sin sings, and it becomes "another piece of my song," as if this feeling is simply part of who the speaker is. The title, "Sacrificial," adds a note of risk: loving may cost something. Still, the mood is less regretful than affectionate, a gentle acceptance of one's own unruly feelings.