melt into (someone's) arms

Translations
раствориться в (чьих-то) объятиях
After a long day, she just wanted to melt into his arms.
После долгого дня она просто хотела раствориться в его объятиях.
Definitions
To relax completely and feel safe or comforted while being embraced by someone, often due to strong feelings of love, affection, or relief.