He certainly can't stay around at least

"Damn..." Jack mumbled to himself, as he tried his best to turn away from the scene, but found it increasingly difficult to keep pretending like he didn't realize the fact that his daughter was actually about to get off right in front of him. Her short, sudden gasp of pleasure made him finally wake up from his stupor though, and he somehow managed to start withdrawing towards the open door.

"Uhn...?" She moaned a little again, like if she was almost trying to make him stay a bit longer, but otherwise looked like she was barely aware that he was still in the room while she slumped forwards on top of her bed. It was obviously too late for her to stop what she'd already started, and Jack had some very different feelings on the matter when he carefully closed the door behind him.

Hopefully she would remember to lock it the next time she wanted some privacy, but for some reason some parts of Jack refused to see that as something positive. In fact it took a lot of his remaining willpower just to keep walking, instead of staying to listen outside of the girl's room, and even more so to shake the various images of what was going on inside from his mind.

He sill wasn't even sure of what had just happened though, but quickly decided to leave it be for some time later. Quite obviously, the most pressing matter was just that he'd allowed himself to stay in the room for as long as he did, and he really didn't know how to look the girl in the eyes again in the next couple of days to come...