Only if it is for you. Clearly, he needs supervision, and I cannot imagine any easier way.

[ It makes no difference to Yusuke. There used to be two other people living here that he knew less about than Shinji. Even if the other Persona user is angry with him, it would be for the best. After everything that's gone down here, he's starting to get better at dealing with angry friends. ]

Not a guard, per se. An angry tiger.