Innocent and Twisted Flowers

One rainy day, Yotsuba was almost run over by a car, but was rescued by Soichi, a florist. Soaking wet, Soichi invited Yotsuba into his house where he lived with his sister, and lent him a bath. Yotsuba was touched by his kindness, and he unintentionally revealed that he's gay. When Yotsuba told him that he had been keeping it a secret from everyone, Soichi had kind words for him. However, Soichi has a "secret past" that he's been keeping to himself...