Fire in His Fingertips: A Flirty Fireman Ravishes Me with His Smoldering Gaze Vol. 9 (manga)

When Ryo's brother Riku goes missing, she's extra thankful for her relationship with firefighter Souma, who uses his training and expertise to locate him. After Riku reveals he was out in the wilderness on purpose to prepare for getting married, Ryo can't keep thoughts of marrying Souma out of her mind. Is it finally time for the two to tie the knot, or are they moving way too fast?