Girl stanning a group hopes to get some action but ends up in an awkward situation

Hello everyone I’m trying to recall the name of a BL I started reading months ago. I’m pretty sure it was a manga about a girl wanting to follow a boy’s band around because she hopes they’ll bring her backstage and have sex with her (they do) and possibly leech off them. Her older brother decides to go with her just for safety and ends up liking the group too and tags along after.
Fast forwrad, the girl ends up in an hotel room with the members and other girls and they start having sex in the dark. But at some point two members have sex by mistake, and everyone notices and is weirded out. But they keep having sex on the low, the top is like super disgusted but the bottom kinda likes it.
If I’m not mistaken the brother never really gets involved with the boys but I don’t remember how that ends😩 thank you for your help