Wanda
It's not that I don't understand, it's that it's my baby brother's mind you're going into. I know that you love him and that he loves you. But, Derek wouldn't actively allow someone inside his mind.
Yes, while you're intimate. That's different than going into his mind while he's being all... well, acting like he used to when we were little kids.
That's my baby brother and I'm very protective of him. I always will be. But, if something happens to you while you're trying to figure out what's going on... then what use is that to anyone?
Then you'll be acting as weird as him and we're all screwed.