Sneak in or ask?

Okey so my boyfriend and I have been together for a year and a half. We've done everything (sexually) but we haven't been able to sleep together for a single night. We are yearning to sleep together and my parents are out of town this weekend. My parents are super conservative but my aunt( who is staying with us) is super liberal. So, should I risk asking her if I can sleep with my boyfriend or should I sneak him in (even if there is risk of getting caught)? The circumstance for sneaking him in is incredibly favorable but I don't know ir I should just ask her for her permission or just take the risk. What would you girls do?