Ianto was on Jack's lap in his office chair, as was customary during extended free periods of time. Jack was doing his paperwork with one hand, his other holding Ianto's waist. His eyes, too, occasionally strayed from his writing to admire the young man; and his lips, especially, strayed to Ianto's neck.
It was during a particularly passionate kiss that Owen thundered up the stairs and threw the door open with a loud, "Jack!"
The man in question whipped his head around to ask what was wrong, but the momentum tipped his chair over. The chair, with Ianto and himself still in it, crashed onto the floor.
"Ah, shit," Owen said eloquently, running towards them. He knelt down next to Jack. "Just found that Weevils have two livers, no need to faint from excitement."
"Wasn't planning on it," Ianto said tightly from where he lay underneath Jack. He clutched his right elbow and watched Jack glare at Owen. "From pain, on the other hand…"
"No one's doing any fainting," Owen directed.
Owen kept grumbling to himself as he began to examine Ianto, and Jack backed him up with a firm nod and gently kissed Ianto's forehead.