It happened many years ago when they first met him.

Rin held his sister away from him; he refused to let some boy take her away from him and perhaps hurt her.

The young half-demon watched with the eyes of an infatuated school boy as he stared at the other; may be there was more to it then Rin initially assumed.

He spent most of his days helping out his sister in the garden and as such remained close to her, guarding her from any potential dangers and trying to fill in the shoes of their grandmother that they both desperately missed.

All they wanted was to see her again and go to Amahara together.

Rin could imagine such a place filled with beautiful plants though he imagined it as well as a place where others who tended to stare too long, would not realize his demonic blood that his 'mother' had informed him of years before to avoid secrets and force the world's secrets upon him.

It was the reason for his self esteem issues and the reason that he shied away from some of the excorcists that appeared; his sister however adored him despite that and insisted that he was not dangerous as he had never went on to the demon side as the only signs of his blood line were those of genetics and not the obvious signs.

Rin knew that their garden was guarded from demons other than him, but sometimes things just went wrong.

He and his younger sister were fifteen by this point, and an exorcist, the one they both fancied, had arrived to buy stuff from them with his father.

Shiemi was in the garden while Rin was called out to meet the father of the exorcist who happened to double as the Paladin.

He nervously stared at the two as if feeling that his distinctly human features shown his blood line.

Yukio and the Father as Rin knew that man to be a Catholic priest stared at him as he spoke up nervously before he heard his sister's screams.

Rin was off like lightning, and it didn't take him long to transform into his demonic self in his sudden anger and fierce protectiveness.

He easily moved forward to fight off the demons that attacked his sister and that was when it was known which twin possessed more of their father's traits.

Rin though felt the presence of his crush beside him as they went to destroy the demon's and fight away the danger upon the girl of the three.

Thankfully, Rin was there to hold her close and treat her pain away as he'd learned like his sister, his mother, and his grandmother knew how to treat such wounds though the eyes of the priest and of his son stayed rooted on Rin while he treated his 'little' sister.