Fire in His Fingertips 2: My Boyfriend is a Fireman

Story

The second season of Yubisaki Kara Honki no Netsujou. Ryou and Souma—who revealed their feelings for each other—have finally started dating. When they thought their hearts and bodies were more deeply connected during their lovey dovey days, her ex-boyfriend Rei came to where they work. The three are reminded of their school days when their feelings grew apart. Ryou doesn't want to get involved, but will her heart choose a different path? (Source: Ascendant Animation) Note: The complete edition with explicit scenes was distributed web via Comic Festa Anime Zone.

Synopsis via AniList (English).