@luithe well, i do have my own room, so long as nobody's a snoop, no one'll find it
it also helps that i sleep when everyone else is awake, so i always have the best opportunity to wank off and clean everything
unfortunately it means there's only a select few hours i can really jerk off, or at least sneak to the bathroom and clean the shit
also helps to wrap it in a towel or something or pretend you're taking a shower to get it clean, then move it back to your room when you're done
i also learned a little bit of social engineering, so i know playing it normal means no one gives a shit, and honestly, so long as they don't ask stupid menial questions, you'll tend to get away