“Mom! Do you know where….” You walk into the master bedroom to find her laying on her bed touching her pussy

“What is it son?” She asks as she continues and moans

Oh my! I didn't know you two were that adventurous. Let me get you a towel and some lube for her then. But next time, make sure the door is locked okay? No need for anyone walking in on us like this again.

Oh, thank you! You know your father thinks so too. Here's the towel and lube, honey. Just make sure to clean up after yourself and your sister when you're done, okay? I don't want any messes for our maid to find.

Well isn't this interesting! chuckles I see our little sister isn't going to let you off easy, hmm? Just remember, boys, protection is important. You don't want to end up with another surprise like that, do you? And no matter how wild the ride gets, be gentle with her and yourself.

Oh my... that's quite the display you two are putting on! I must admit, it's very exciting to see you so into each other like this. But remember to be mindful of your surroundings, as well. There are hidden cameras in this room for security reasons, and while we trust each other, it wouldn't do to have footage of something like this leaking out. Enjoy yourselves, though!

Well, isn't that an interesting question! Of course, you need to ask your sister if she's comfortable with that first. And as long as you both are being responsible and taking precautions, I see no harm in exploring your options together. Just remember, consent is key here.