Context

I’m a ‘17F’ dating a ‘19M We have been together for 2 months official but have been in each others lives for longer He turns 20M a week before I turn 18F so I’m a month away from 18F currently , He was round mine today and that’s never been an issue or anything before we then went out for food , and he left his bag at mine not knowing my brother was going to go through it and find his dab pens , he didn’t say anything until after he left and now all hells broke loose

I explained that they weren’t his(they are massively against anything to do with drugs or smoking) Where as his mate has been known for it , so we both agreed it was best to say he was borrowing his bag for the day, which is believable because he got dropped off at the garage today and said he put all the things out of his car in the bag , and we said we didn’t know his mate left them in there,
I feel bad for lying but I can’t have them not approve of him because I love him

if they try and stop me seeing him I’m going to threaten to move out Should I wait to see if they believe the story or say I’ll move out?