Rengoku's love language was physical touch. He was very open about his feelings and thoughts. Because he was such an openly affectionate person, valentines day was always his favorite holiday.

When the day came, he showered his partner in flowers, chocolates, candies, you name it. He went all out this year, even buying them a rather expensive box of lipstick. What he wasn't expecting however, was to have his face absolutely smothered in lipstick, but he wasn't complaining in the slightest.