@AbyssalMonkey at rank 3 it might become one way thus making it really usefull for sneaking. but then again its lifestyle magic so it might not have combat use.
If i remember correctly lifestyle magic is seen as good magic if i remeber correctly lifestyle magic 2 is wanted in theaters and in case of the mc its good for him having sex.
You got to be quicker on the draw than that son.
Also he can reshape the bubble anyway he likes so he could easily include the door to hear it open or knocking if he wanted to. He didn't think ahead. Of course in that situation, even hearing the door open up would have been too late.
A convenient magic that makes things clean and one that cancels noise. I can think of more than a few uses to combine these two together, and not all of them are lewd. Just most.