The third point of view:
It was purely an accident. That day, their mother Reina had sent her to Allen's room to get the stupid boy downstairs. But when she knocked on the door no one responded.
Ailee knocked on the door several times and when there was no response, she pressed her ear against the door to discover that her idiotic brother was playing rock music. She had been wasting her energy all this while. Wonderful! Just wonderful!
Aggravated, Ailee kicked the door open and went in without any care - she was done waiting - but she halted in her footsteps.
Lo and behold, there was her brother, Allen, butt naked with his jeans heaped around his feet (he must have been in a hurry) while slamming into the girl pushed up against the wall.
Ailee wanted to scream, her mouth opened wide, but no words came out of her mouth. Her eyes were wide as she stood there shocked and traumatized. What the hell?