Leave her in there

You turn the program back on and set it to loop until turned off manually. You use the Professor's bypass code to lock it so no one can change or stop the simulation without said code. You think about changing Xavier's memories so that only you know the code but you think better of trying to mess with the mind of such a powerful telepath unless you absolutely have to. You set the doors to lockdown mode so just in case Rogue tries she won't just tear through them and make your way outside. You input the same lockdown command into the keypad and once again use the bypass code so that no one can into the control room with you say so. On the way out you run into Beast again. You use your powers to make him trust you so you don't need to explain who you are to him or why you had him leave.

"Hello again, I just returned because I believe Rogue should be winding down her training session by now and I should shut it off for her," He says, "I hope that's okay."

"Uh, sure but Rogue already left. The Danger Room's off. In fact, can you do me a favor Beast?" You respond, having though up a devilish idea.

"Sure, what is it?" He asks, eager to help.

"Well the Danger Room is actually shut down for repairs, so if you don't mind, could you make a sign saying that and hang it up here so no one wanders in and gets hurt?" You point a thumb behind you to the door that leads to the room.

"I'd be happy to. We wouldn't want anything bad to happen. Thank you for telling me. Usually the Professor informs me of these updates. I hope my quick training session with Rogue didn't aggravate any problems." Beast said, putting his hand on his chin, looking kind of worried.

"Oh, not at all. Just don't go in there. Too dangerous. Well I have to go, but thank you," You walk past him and pat him on his shoulder playfully, "And don't forget about that sign!"

And with that you go back to wandering the mansion, trying to find something new to peak your interest.